Automatic guiding rule clamp
By designing automatic ruler clamps, using the coordination of lifting modules and ruler blanks, the position offset problem caused by manual positioning offset in glass processing is solved, the positioning accuracy and processing stability are improved, and the scrap rate is reduced.
Patent Information
- Application Number
- CN202422079970.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-26
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-08-26
AI Technical Summary
In existing glass processing, due to manual position deviation, the product position deviation leads to high scrap rate.
An automatic ruler clamp is designed, including fixed base, adsorption base blank, lifting module and ruler blank. The lifting module is used to drive the ruler blank to position, the adsorption base blank is matched with the product in a contour, and the ruler blank and the adsorption base blank are retreated to ensure product edge avoidance and reduce positioning offset.
It improves the repeat positioning accuracy of the product, reduces the scrap rate caused by position deviation, and improves the stability and efficiency of processing.
Smart Images

Figure CN223290070U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of glass processing, in particular to an automatic ruler clamp. Background Art
[0002] Glass processing requires a CNC fixture that uses manual loading and alignment. The fixture primarily consists of a fixed base, a vacuum base, and a guide. During processing, the product is placed on top of the vacuum base, which secures the product and prevents it from shifting during processing. The fixed base primarily secures the vacuum base to the machine. The guide is required due to the unique nature of the process. Since the entire perimeter of the product must be free of any obstructions to the tool and the product must be immersed in a specific cutting fluid, the vacuum base and the product are not completely compatible. Clearance around the product's edges is required. When the product is aligned and placed on top of the vacuum base, the base's edges are recessed relative to the product's edges, leaving the entire perimeter of the product hanging free. Therefore, to facilitate alignment and placement of the product on the vacuum base, the fixture must be supplemented with a manual guide. Specifically, the guide is used to position the product with distinct features, such as corners, against the guide. After the product is manually positioned and placed, the vacuum suction function is manually activated to firmly adhere the product to the top surface of the vacuum base. Processing can then begin. Because a template is used to position the product, the manual template's positioning reference surface is on the vacuum base. Due to issues such as long-term processing immersion and residual processing debris, manual placement of the template for positioning can easily cause slight deviations in the template's position each time. This can lead to scrapping of the product due to positional shifts using existing processing methods. Therefore, improvements are needed to minimize the impact of processing debris and manual placement on the repeatability of product positioning. Utility Model Content
[0003] The technical problem to be solved by the utility model is to provide an automatic ruler clamp to address the defect that the existing processing method in the prior art may cause the product to be scrapped due to position deviation.
[0004] The technical solution adopted by the utility model to solve its technical problems is: constructing an automatic ruler clamp, including a fixed base, an adsorption base blank, a lifting module, a ruler blank, and a water tank for containing polishing liquid; the water tank is arranged on the fixed base, the adsorption base blank and the lifting module are installed on the fixed base, and the adsorption base blank is located in the water tank, and the lifting module is located outside the water tank; the ruler blank is horizontally placed beside the adsorption base blank, and the ruler blank is also connected to the lifting module across the water tank, so as to move up and down beside the adsorption base blank with the lifting module.
[0005] Furthermore, in the automatic straight edge fixture of the present invention, the adsorption base blank and the straight edge blank are both made of machinable plastic material.
[0006] Furthermore, in the automatic straightedge fixture described in the present invention, the top surface of the adsorption base blank is conformally matched to the lower surface of the product, and the edge of the top surface of the adsorption base blank is retracted relative to the edge of the product. The straightedge blank and the adsorption base blank are spaced apart in the horizontal direction, and the side of the adsorption base blank facing the adsorption base blank serves as a reference for positioning the product. When the product is placed on the top surface of the adsorption base blank, the edge of the product is offset against the reference.
[0007] Furthermore, in the automatic straightedge fixture described in the present invention, the adsorption base blank includes a supporting portion located at the bottom and a positioning portion located at the top, the upper surface of the positioning portion is used to contour and position the product, the four sides of the positioning portion are recessed relative to the edge of the product to facilitate product processing, and the four sides of the supporting portion are recessed relative to the four sides of the positioning portion to ensure that the straightedge blank is avoided.
[0008] Furthermore, in the automatic ruler clamp described in the present invention, the ruler blank includes a reference portion and a connecting portion, the side shape of the reference portion facing the adsorption base blank is consistent with the shape of a portion of the edge of the product to serve as a reference for positioning and placing the product, and the connecting portion spans the water trough and is connected to the lifting module.
[0009] Furthermore, in the automatic ruler clamp described in the present invention, the reference part is in the shape of an L-shaped horizontal plate, and its two side edges forming the inner angle serve as the reference, and one of its side edges forming the outer angle is connected to the connecting part; after the connecting part is connected to the reference part, it extends upward and bends to the side away from the reference part, crosses the water tank and is connected to the lifting module.
[0010] Furthermore, in the automatic straightedge fixture of the present invention, a sidewall of the water tank is provided with an escape opening for the straightedge blank to pass over, and when the straightedge blank reaches the highest point driven by the lifting module, it is no higher than the top edge of the water tank;
[0011] An elastic material is provided between the ruler blank and the water tank at the escape port, so that after the ruler blank rises, it rebounds and blocks the escape port, thereby preventing the polishing liquid from overflowing from the escape port as much as possible.
[0012] Furthermore, in the automatic ruler clamp described in the present invention, the lifting module includes a slide cylinder, an upper waterproof cover, and a waterproof shell bottom. The waterproof shell bottom is installed on the fixed base, and the slide cylinder is assembled in the waterproof shell bottom. The air pipe passes through the hole in the side wall of the waterproof shell bottom and is connected to the air nozzle of the slide cylinder. The upper waterproof cover is covered on the waterproof shell bottom and is connected to the lifting end of the top of the slide cylinder.
[0013] Furthermore, in the automatic ruler fixture of the present invention, the slide cylinder is placed in the bottom of the waterproof shell and connected to the bottom of the waterproof shell by screws, and screw glue is applied to the screw threads;
[0014] The fixing base is provided with a positioning pin, the bottom of the waterproof shell is positioned on the fixing base through the positioning pin and connected to the bottom of the waterproof shell through screws, and screw glue is applied to the screw threads;
[0015] The ruler blank, the upper waterproof cover and the slide cylinder are connected by screws, and waterproof glue is applied on the screw threads.
[0016] Furthermore, in the automatic ruler clamp described in the present invention, a plurality of adsorption holes are provided on the top surface of the adsorption base blank, an air duct connected to the adsorption holes is provided on the bottom, a positioning pin hole and a vacuum air hole are provided at the bottom of the water sink, and the adsorption base blank is positioned and installed to the bottom of the water sink through the positioning pin hole and the air duct is connected to the vacuum air hole.
[0017] The automatic ruler clamp of the present invention has the following beneficial effects: the present invention utilizes the lifting module outside the water tank to drive the ruler for positioning, the ruler blank is horizontally placed beside the adsorption base blank, and the ruler blank is also connected to the lifting module across the water tank so as to move up and down beside the adsorption base blank with the lifting module. When processing the product, it is only necessary to place the product and then push it horizontally to the ruler blank for positioning. After positioning, the ruler blank will drop without affecting the product processing. The repeated positioning accuracy of the product each time is greatly improved, which greatly reduces the loss of scrap due to processing position deviation.
[0018] Furthermore, the adsorption base blank and the ruler blank provided by the present invention are both made of machinable plastic materials, so the adsorption base blank and the ruler blank can be adapted to the product by cutting and processing. At the same time, the four sides of the lower support part of the adsorption base blank are recessed relative to the four sides of the upper positioning part, thereby ensuring that the ruler blank can be avoided before processing the adsorption base blank. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only embodiments of the present invention. Those skilled in the art can obtain other drawings based on the provided drawings without inventive work.
[0020] Figure 1 This is a schematic structural diagram of the automatic ruler clamp of the utility model;
[0021] Figure 2 This is an exploded view of the automatic ruler fixture of the utility model;
[0022] Figure 3 This is a schematic diagram of the assembly process of the automatic ruler clamp of the utility model;
[0023] Figure 4 It is a schematic diagram of the process of processing products after the automatic ruler clamp of the utility model is assembled. DETAILED DESCRIPTION
[0024] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the relevant drawings. Typical embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.
[0025] refer to Figure 1The automatic straightedge fixture of this embodiment includes a fixed base 1, an adsorption base blank 2, a lifting module 3, a straightedge blank 4, and a water tank 5 for holding polishing liquid. The water tank 5 is provided on the fixed base 1. The adsorption base blank 2 and the lifting module 3 are installed side by side on the fixed base 1, and the adsorption base blank 2 is located in the water tank 5, and the lifting module 3 is located outside the water tank 5. The straightedge blank 4 is placed horizontally beside the adsorption base blank 2, and the straightedge blank 4 is also connected to the lifting module 3 across the water tank 5 so as to move up and down beside the adsorption base blank 2 with the lifting module 3.
[0026] Wherein, the adsorption base blank 2 and the ruler blank 4 are both made of a machinable plastic material, and the adsorption base blank 2 and / or the ruler blank 4 are designed with a margin, so that they can be processed to a suitable size during the assembly process. The top surface of the adsorption base blank 2 is contoured with the lower surface of the product, and the edge of the top surface of the adsorption base blank 2 is recessed relative to the edge of the product, thereby facilitating subsequent processing of the product. The ruler blank 4 is spaced apart from the adsorption base blank 2 in the horizontal direction, and the side edge of the adsorption base blank 2 facing the adsorption base blank 2 (referred to as the positioning edge) serves as a reference for positioning and placing the product. When the product is placed on the top surface of the adsorption base blank 2, the edge of the product is offset against the reference.
[0027] Specifically, refer to Figure 2 The adsorption base blank 2 includes a supporting portion 21 at the bottom and a positioning portion 22 at the top, and the ruler blank 4 includes a reference portion 41 and a connecting portion 42.
[0028] The upper surface of the positioning portion 22 is used to position the product according to its contour. The perimeter of the positioning portion 22 is recessed relative to the product's edges to facilitate processing. The perimeter of the support portion 21 is recessed relative to the perimeter of the positioning portion 22 to ensure clearance for the guide blank 4. It is understood that because the product in this embodiment is a rectangular 2D glass, the positioning portion 22 is designed as a rectangular plate. In reality, the product can also have other shapes, such as circular, triangular, or even irregular shapes, and even 3D glass. Regardless of the shape, the upper surface of the positioning portion 22 only needs to be machined to match the lower surface of the product.
[0029] A plurality of adsorption holes 23 are provided on the top surface of the adsorption base blank 2, and an air duct connected to the adsorption holes 23 is provided at the bottom of the adsorption base blank 2. A positioning pin hole 51 and a vacuum air hole 52 are provided at the bottom of the water tank 5. The adsorption base blank 2 is inserted into the positioning pin hole 51 by a positioning pin or screw to be positioned and installed to the bottom of the water tank 5, and the air duct at the bottom of the adsorption base blank 2 is connected to the vacuum air hole 52.
[0030] The shape of the side of the reference portion 41 facing the adsorption base blank 2 is consistent with the shape of part of the edge of the product to serve as a reference for positioning and placing the product, and the connecting portion 42 spans the water tank 5 and is connected to the lifting module 3. Specifically, the reference portion 41 in this embodiment is in the shape of an L-shaped horizontal plate, and its two side edges forming the inner corner (i.e., the L-shaped edges facing the adsorption base blank 2) serve as a reference, that is, as a positioning edge, facing a corner of the adsorption base blank 2; one of its two side edges forming the outer corner is connected to the connecting portion 42. After being connected to the reference portion 41, the connecting portion 42 extends upward and bends to the side away from the reference portion 41, spans the water tank 5, and is connected to the lifting module 3. The connecting portion 42 as a whole is similar to an L-shaped bend block.
[0031] The water trough 5 is a rectangular trough, which can be integrally formed with the fixed base 1. The left side wall of the water trough 5 is installed with an openable plastic water baffle 13 for discharging the polishing liquid. The right side wall of the water trough 5 is provided with an escape opening 12 for the ruler blank 4 to pass over. An elastic material is provided between the ruler blank 4 and the water trough 5 at the escape opening 12. The elastic material is deformable, so that the ruler blank 4 has room to fall. When the ruler blank 4 falls, it compresses the elastic material to deform. When the ruler blank 4 rises, the elastic material rebounds to block the escape opening 12 to prevent the polishing liquid in the water trough 5 from overflowing from the escape opening 12 as much as possible.
[0032] When the ruler blank 4 reaches its highest point driven by the lifting module 3, the connection portion 42 is no higher than the top edge of the water tank 5, mainly to avoid interference with the product processing structure above. The presence of the avoidance opening 12 provides space for the connection portion 42 of the ruler blank 4 to move up and down.
[0033] The lifting module 3 includes a slide cylinder 31, an upper waterproof cover 32 and an aluminum waterproof shell bottom 33. The waterproof shell bottom 33 is installed on the fixed base 1. The slide cylinder 31 is assembled in the waterproof shell bottom 33. The air pipe passes through the hole on the side wall of the waterproof shell bottom 33 and is connected to the air nozzle 311 of the slide cylinder 31. The upper waterproof cover 32 is made by bending and welding sheet metal, and the edge of the entire component does not leak. The upper waterproof cover 32 is movable on the waterproof shell bottom 33 and is connected to the threaded hole of the lifting end of the top of the slide cylinder 31. During the lifting process of the slide cylinder 31, the upper waterproof cover 32 is always covered on the waterproof shell bottom 33. The side wall of the upper waterproof cover 32 is provided with a strip groove to avoid the air pipe.
[0034] Specifically, the slide cylinder 31 is placed within the waterproof housing base 33 and connected to it via screws, with screw glue applied to the screw threads. The fixed base 1 is provided with a positioning pin 11, and the waterproof housing base 33 is positioned on the fixed base 1 via the positioning pin 11 and connected to it via screws, with screw glue applied to the screw threads to prevent loosening. The straightedge blank 4, the upper waterproof cover 32, and the slide cylinder 31 are connected via screws, with waterproof glue applied to the screw threads.
[0035] refer to Figure 3 , the assembly process of the fixture of this embodiment is:
[0036] First, assemble the lifting module 3 separately. Since a large amount of cutting fluid needs to be sprayed continuously in the processing environment, the liquid may corrode the grease of the cylinder and bring chips into the active parts of the cylinder, which greatly reduces the service life of the cylinder and increases the failure rate of processing. Install the slide cylinder 31 into the waterproof shell bottom 33, pass the air pipe of the slide cylinder 31 through the hole on the side wall of the waterproof shell bottom 33 and connect it to the straight-through air nozzle 311, then connect the slide cylinder 31 to the waterproof shell bottom 33 with screws, and apply screw glue to the screw threads to avoid loosening and positioning deviation caused by vibration during use. The upper waterproof cover 32 is connected to the thread hole of the slide cylinder 31 by screws passing through the through hole. Since this part may need to be disassembled, it only needs to be installed, and waterproofing will be performed in subsequent steps.
[0037] Then, refer to Figure 3 In (a), the assembled lifting module 3 is positioned on the fixed base 1 through the positioning pin 11, and then tightened with screws. Since the fixing screws do not need to be removed later, screw glue can be applied as much as possible to prevent loosening.
[0038] Next, refer to Figure 3 In step (b), take the ruler blank 4 and apply sealant / glass glue to the bottom of the connecting portion 42 for waterproofing. Remove the screws on the upper waterproof cover 32 of the lifting module 3 and tighten them through the through-holes in the connecting portion 42 of the ruler blank 4 and the through-holes in the upper waterproof cover 32 into the threaded holes of the cylinder. Because the ruler blank 4 is designed with margins, this step requires the entire base 1 to be fixed to the CNC processing machine. By fixing the four sides of the base 1 and aligning them, the positioning edge of the ruler blank 4 is machined according to the product to be processed. The positioning edge of the ruler blank 4 is machined and formed. The subsequent product contact position is this positioning edge. Therefore, after this step is completed, all subsequent installation steps are performed on the machine to avoid positioning deviation caused by multiple clamping.
[0039] Next, refer to Figure 3In (c), take the base blank 2. This part is also set with machining allowance. The positioning part 22 of the upper part also needs to be processed according to the target product before use. The positioning part 22 of the lower part has been made to avoid air gaps and will not interfere with the ruler blank 4. The water tank 5 on the fixed base 2 has been opened with a positioning pin hole 51 and a vacuum air hole 52. The positioning pin hole 51 is used to roughly position the base blank 2 and is fixed by screw locking. After the fixation is completed, Figure 3 As shown in (d) in the figure. The positioning part 22 of the upper part of the base blank 2 is directly processed using the machine origin coordinates processed by the ruler blank 4. The processing content includes processing the side and upper surface of the positioning part 22, so that the upper surface is matched with the lower surface of the product, and the side is matched with the product and avoids the edge of the product. At this time, the ruler blank 4 should be in a lowered state and located next to the support part 21. Only after the positioning part 22 is processed, there is enough space for lifting. After the base blank 2 is processed, Figure 3 Finally, refer to Figure 3 In (f), the cylinder is in the rising state, the ruler blank 4 rises to the highest position, and the machine flattens the upper surface of the reference portion 41 of the ruler blank 4. In addition, the space between the ruler blank 4 and the water tank 5 should be filled with elastic material as much as possible to keep the product immersed in the liquid as much as possible during the processing.
[0040] refer to Figure 4 The process of processing the product of the fixture of this embodiment is:
[0041] like Figure 4 In (a), the ruler blank 4 is in a descending state, and the product material is taken;
[0042] like Figure 4 In step (b), the ruler blank 4 rises, the incoming material is aligned with the positioning edge of the ruler blank 4, and the vacuum is turned on to suck the incoming material tightly;
[0043] like Figure 4 In (c), the ruler blank 4 is lowered to prepare for processing the incoming material;
[0044] like Figure 4 (d) in which the incoming materials are processed to obtain the product;
[0045] like Figure 4 (e) in which the product is taken away;
[0046] Continue to follow Figure 4 Take out a piece of material from (a)-(e) for processing.
[0047] If after processing for a period of time it is found that the worn surface of the base blank 2 is uneven / the incoming material cannot be sucked tightly, the ruler blank 4 can be lowered to a low position and the base blank 2 can be processed; if the worn surface of the ruler batch is uneven / the processed finished product has a symmetrical deviation, the ruler blank 4 can be raised to a high position and the ruler blank 4 can be processed.
[0048] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be an intermediate element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only. The term "and / or" used herein includes any and all combinations of one or more of the relevant listed items.
[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.
[0050] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which are all within the protection of the present invention.
Claims
1. An automatic ruler fixture, characterized in that: The invention comprises a fixed base (1), an adsorption base blank (2), a lifting module (3), a ruler blank (4), and a water tank (5) for containing polishing liquid; the water tank (5) is arranged on the fixed base (1), the adsorption base blank (2) and the lifting module (3) are installed on the fixed base (1), and the adsorption base blank (2) is located in the water tank (5), and the lifting module (3) is located outside the water tank (5); the ruler blank (4) is horizontally placed beside the adsorption base blank (2), and the ruler blank (4) also crosses the water tank (5) and is connected to the lifting module (3) so as to move up and down beside the adsorption base blank (2) along with the lifting module (3).
2. The automatic ruler fixture according to claim 1, characterized in that: The adsorption base blank (2) and the ruler blank (4) are both made of machinable plastic material.
3. The automatic ruler fixture according to claim 1, characterized in that: The top surface of the adsorption base blank (2) is conformed to the lower surface of the product, and the edge of the top surface of the adsorption base blank (2) is recessed relative to the edge of the product. The ruler blank (4) and the adsorption base blank (2) are spaced apart in the horizontal direction. The side of the adsorption base blank (2) facing the adsorption base blank (2) serves as a reference for positioning and placing the product. When the product is placed on the top surface of the adsorption base blank (2), the edge of the product is against the reference.
4. The automatic ruler fixture according to claim 1, characterized in that: The adsorption base blank (2) includes a supporting portion (21) at the bottom and a positioning portion (22) at the top. The upper surface of the positioning portion (22) is used for profiling and positioning the product. The four sides of the positioning portion (22) are recessed relative to the edge of the product to facilitate product processing. The four sides of the supporting portion (21) are recessed relative to the four sides of the positioning portion (22) to ensure that the ruler blank (4) is avoided.
5. The automatic ruler fixture according to claim 1, characterized in that: The ruler blank (4) comprises a reference portion (41) and a connecting portion (42). The side shape of the reference portion (41) facing the adsorption base blank (2) is consistent with the shape of a portion of the edge of the product to serve as a reference for positioning and placing the product. The connecting portion (42) spans the water tank (5) and is connected to the lifting module (3).
6. The automatic ruler fixture according to claim 5, characterized in that: The reference portion (41) is in the form of an L-shaped horizontal plate, with its two sides forming a negative angle serving as the reference, and one of its sides forming a positive angle being connected to the connecting portion (42); after being connected to the reference portion (41), the connecting portion (42) extends upward and bends away from the reference portion (41), crossing the water tank (5) and connecting to the lifting module (3).
7. The automatic ruler fixture according to claim 1, characterized in that: The side wall of the water trough (5) is provided with an escape opening (12) for the ruler blank (4) to pass over, and the ruler blank (4) is not higher than the top edge of the water trough (5) when it reaches the highest point driven by the lifting module (3); An elastic material is provided between the ruler blank (4) and the water tank (5) at the avoidance opening (12), so as to rebound and block the avoidance opening (12) after the ruler blank (4) rises, thereby preventing the polishing liquid from overflowing from the avoidance opening (12) as much as possible.
8. The automatic ruler fixture according to claim 1, characterized in that: The lifting module (3) includes a slide cylinder (31), an upper waterproof cover (32), and a waterproof shell bottom (33); the waterproof shell bottom (33) is installed on the fixed base (1); the slide cylinder (31) is assembled in the waterproof shell bottom (33); the air pipe passes through the hole on the side wall of the waterproof shell bottom (33) and is connected to the air nozzle (311) of the slide cylinder (31); the upper waterproof cover (32) is covered on the waterproof shell bottom (33) and is connected to the lifting end of the top of the slide cylinder (31).
9. The automatic ruler fixture according to claim 8, characterized in that: The slide cylinder (31) is placed in the waterproof shell bottom (33) and connected to the waterproof shell bottom (33) through screws, and screw glue is applied to the screw threads; A positioning pin (11) is provided on the fixed base (1), and the waterproof shell bottom (33) is positioned on the fixed base (1) through the positioning pin (11) and connected to the waterproof shell bottom (33) through screws, and screw glue is applied to the screw threads; The ruler blank (4), the upper waterproof cover (32) and the slide cylinder (31) are connected by screws, and waterproof glue is applied to the screw threads.
10. The automatic ruler fixture according to claim 1, characterized in that: The top surface of the adsorption base blank (2) is provided with a plurality of adsorption holes (23), and the bottom is provided with an air channel connected to the adsorption holes (23); the bottom of the water tank (5) is provided with a positioning pin hole (51) and a vacuum air hole (52); the adsorption base blank (2) is positioned and installed on the bottom of the water tank (5) through the positioning pin hole (51), and the air channel is connected to the vacuum air hole (52).