Adjustable inner limiting tool for vacuum cup

Abstract

The utility model relates to an adjustable inner limiting tool for a vacuum cup, which comprises a strip-shaped seat body provided with a plurality of inner limiting components at intervals, and the inner limiting components are inserted with lifting negative pressure positioning components which are adjustably adsorbed on the inner bottom surface of the cup under negative pressure in a manner of penetrating through the axes of the inner limiting components. Therefore, the inner limiting assembly and the lifting negative pressure positioning assembly are matched to carry out adsorption positioning and cup opening blocking on a cup. A transmission rotating assembly capable of synchronously driving the multiple inner limiting assemblies installed side by side to rotate synchronously is arranged in the strip-shaped base. And the lifting negative pressure positioning assembly penetrates through the axial lower end of the strip-shaped seat body and is connected with a negative pressure generating unit through a connecting pipe. According to the vacuum cup, the cup opening can be adaptively shielded, and meanwhile the cup body of the vacuum cup can be stably clamped in an adjustable inner support limiting and negative pressure adsorption positioning mode so that the outer side wall of the cup body can be effectively exposed.

Description

Technical Field

[0001] The utility model relates to the technical field of cup limiting clamping equipment, in particular to an adjustable inner limiting tooling for a thermos cup. Background Art

[0002] A thermos cup is generally a water container made of ceramic or stainless steel with a vacuum layer, with a lid on the top and a tight seal. The vacuum insulation layer can delay the heat dissipation of the water or other liquids contained inside to achieve the purpose of heat preservation. At present, in the process of processing the cup body of a thermos cup, the cup body needs to be polished, cleaned, painted, and printed in stages. In order to improve the aesthetics, it is usually necessary to perform related processing on the outer wall of the cup body separately. However, the existing conventional cup clamping structure is usually an external clamping structure, which cannot effectively expose the entire outer wall of the cup body, resulting in a single clamping movement that cannot effectively process the outer wall. Although, in the prior art, the thermos cup is sleeved on a sleeve rod, and then the sleeve rod and the thermos cup are transported to the nozzle part for spraying paint to effectively expose the outer wall of the cup body. However, the sleeve rod cannot stably limit the position of the cup body, and its single support structure cannot guarantee the stability of the cup body during processing. The thermos cup is easily dropped or shaken during transportation due to the vibration caused by the operation of the automatic spraying device. In addition, the structure cannot block the opening surface of the cup body, which can easily cause the paint to diffuse from the cup mouth to the inside of the cup during spraying and affect the spraying effect. The existing sleeve rod support cannot stably limit the inner support of the cup body and cannot meet the needs of cup body processing. In addition, for thermos cups with different inner wall diameters, the clamping range cannot be adjusted, the stability of the support clamping cannot be guaranteed, and the cup mouth cannot be effectively blocked. Utility Model Content

[0003] The utility model aims to provide an adjustable inner limit tooling for a thermos cup, which can adaptively block the cup mouth and stably clamp the cup body of the thermos cup by means of adjustable inner support limit and negative pressure adsorption positioning to effectively expose the outer wall of the cup body, so as to solve the problem that the existing clamping tooling usually adopts an external clamping method to limit the cup body, thereby blocking the outer wall of the cup body, affecting painting, electroplating and other processing. The existing internal support clamping structure has poor stability and cannot effectively locate the processing position of the thermos cup. The existing clamping structure cannot effectively block the cup mouth, resulting in the problem that painting and other processing can easily cause contamination in the cup.

[0004] The technical solution adopted by the utility model is: an adjustable internal limit tooling for a thermos cup, comprising a strip-shaped seat body with a plurality of internal limit assemblies arranged in intervals, wherein the internal limit assembly is plugged with a lifting and lowering negative pressure positioning assembly which is absorbently adsorbed on the inner bottom surface of the cup in a manner that passes through its axis, so that the internal limit assembly and the lifting and lowering negative pressure positioning assembly cooperate to adsorb and position the cup and seal the cup mouth; a transmission rotating assembly is arranged in the strip-shaped seat body, which can synchronously drive the plurality of internal limit assemblies installed side by side to rotate synchronously; the lifting and lowering negative pressure positioning assembly passes through the axial lower end of the strip-shaped seat body and is connected to a negative pressure generating unit through a connecting pipe.

[0005] According to a preferred embodiment, the internal limit assembly includes a supporting tube column, an internal support sealing cone and a rotating bearing, wherein the supporting tube column is rotatably inserted on the strip-shaped seat body through the rotating shaft bearing, and the axial upper end of the supporting tube column is connected to the internal support sealing cone capable of limiting and sealing the cup mouth.

[0006] According to a preferred embodiment, a through tube is centrally provided on the inner support and sealing truncated cone, an annular special-shaped airbag is sleeved on the part of the through tube body above the inner support and sealing truncated cone, and a circular disc is also sleeved on the through tube, and a through opening is opened on the circular disc for the sac body part of the annular special-shaped airbag to bulge upward and expand; the upper edge of the disk body is also circumferentially spaced to support the inner support curved rods that bulge outward laterally and abut against the inner side surface of the cup.

[0007] According to a preferred embodiment, the lifting negative pressure positioning assembly includes a support plate, a hydraulic lifting rod, an air guide tube and a negative pressure suction head, wherein the support plate is supported on the top of the through-tube, and a plurality of hydraulic lifting rods are circumferentially spaced apart on the support plate, and the axial upper ends of the plurality of hydraulic lifting rods are all connected to the negative pressure suction head to drive the negative pressure suction head to lift and lower; the bottom of the negative pressure suction head is also connected to the air guide tube that penetrates the support plate and extends into the through-tube.

[0008] According to a preferred embodiment, an inverted L-shaped pressure rod is provided on the telescopic rod body of the hydraulic lifting rod, and the axial lower end of the inverted L-shaped pressure rod is also connected to an annular pressure plate movably sleeved on the through pipe.

[0009] According to a preferred embodiment, the negative pressure suction head includes an adsorption seat, an elastic silicone ring and a plug body, wherein a through cavity is opened in the adsorption seat, and the plug body blocks the through cavity by a spring limiter; the upper end surface of the adsorption seat is also provided with the elastic silicone ring that can abut against the inner top surface of the cup.

[0010] According to a preferred embodiment, an elastic rubber ring is sleeved on the oblique side wall of the inner supporting and sealing truncated cone, which can fill and seal the gap between the cup supported by the inner supporting and the side wall surface.

[0011] According to a preferred embodiment, a first accommodating cavity for accommodating the transmission rotating assembly is opened inside the strip-shaped seat body.

[0012] According to a preferred embodiment, the transmission rotating assembly includes a transmission tooth sleeved on the support column, a transmission belt sleeved on a plurality of the transmission teeth arranged side by side, and a rotating motor capable of driving the transmission belt to rotate.

[0013] According to a preferred embodiment, several parallel air guide tubes sequentially penetrate the through tube and the supporting tube column and are connected with the rotating sealing joint of the connecting tube; the rotating sealing joint is installed at the port of the parallel branch pipe of the connecting pipe, and the parallel branch pipe is connected with the negative pressure generating unit through a converging main pipe.

[0014] The beneficial effects of the utility model are:

[0015] The inner limit assembly provided in the present application can ensure the clamping stability of the cup by the inner support limit and the opening surface blocking limit, and further improve the positioning stability by the negative pressure adsorption of the lifting and lowering negative pressure positioning assembly, and the lifting and lowering negative pressure positioning assembly can ensure that the opening of the cup can effectively abut against the inner support blocking truncated table of the inner limit assembly by pulling the cup in the negative pressure adsorption positioning state, thereby ensuring the airtightness of the port blocking. The inner limit assembly can effectively adapt to cups of various sizes through the elastically deformable inner abutment limit and the adaptability of the truncated table seat body to improve its adaptability range. The lifting and lowering negative pressure positioning assembly provided in the present application improves the stability of the inner cavity clamping limit by the negative pressure adsorption positioning method. And it can ensure the effectiveness of the blocking by adjusting the clamping position of the cup, so as to avoid the problem of cup cavity contamination during painting and other processing due to the presence of gaps at the cup mouth, thereby ensuring the accuracy of the processing area. The transmission rotation assembly provided in the present application can drive multiple internal limit assemblies to rotate around their own axes, so as to improve the usable range of the limit tooling in different processing steps, so that it can more effectively assist in completing the uniform coating of the side wall of the cup and other processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a preferred adjustable inner limit tooling for a thermos cup proposed by the utility model;

[0017] Figure 2 It is a structural schematic diagram of a disk portion of a preferred adjustable inner limit tooling for a thermos cup proposed by the utility model;

[0018] Figure 3 It is a structural schematic diagram of a preferred negative pressure suction head of an adjustable internal limit tooling for a thermos cup proposed by the utility model;

[0019] Figure 4 It is a plan view of a plug body of a preferred adjustable inner limit fixture for a thermos cup proposed by the utility model.

[0020] Reference numerals list

[0021] 1: Strip seat; 2: Internal limit assembly; 3: Lifting negative pressure positioning assembly; 4: Transmission rotation assembly; 5: Connecting pipe; 6: Negative pressure generating unit; 11: First accommodating chamber; 21: Supporting pipe column; 22: Internal support blocking cone; 23: Rotating bearing; 24: Through-tube; 25: Annular special-shaped airbag; 26: Disc; 27: Internal support curved rod; 28: Elastic rubber ring; 31: Support plate; 32: Hydraulic lifting rod; 33: Air guide tube; 34: Negative pressure suction head; 35: Inverted L-shaped pressure rod; 36: Annular pressure plate; 41: Transmission gear; 42: Transmission belt; 43: Rotating motor; 51: Rotating sealing pipe head; 52: Parallel branch pipe; 53: Converging main pipe; 261: Through-port; 341: Adsorption seat; 342: Elastic silicone ring; 343: Plug body; 344: Spring; 3411: Through-cavity. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be briefly introduced below in combination with the drawings and the descriptions of the embodiments or the prior art. Obviously, the following descriptions of the structures of the drawings are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] The technical solution provided by the present invention will be described in detail below by way of examples with reference to the accompanying drawings. It should be noted that the description of these examples is used to help understand the present invention, but does not constitute a limitation of the present invention. In some examples, some implementation methods are not described or are not described in detail because they belong to existing or conventional technologies.

[0024] In addition, the technical features recorded in this article, or the steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can also be combined in any suitable manner in one or more embodiments. For those skilled in the art, it is easy to understand that the steps or operation sequence of the methods related to the embodiments provided herein can also be changed. Any order in the drawings and embodiments is only for illustrative purposes and does not imply a requirement to follow a certain order unless it is explicitly stated that a certain order is required.

[0025] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, under reasonable circumstances (not constituting a self-contradiction), include direct and indirect connections (couplings).

[0026] The following is a detailed description with reference to the accompanying drawings.

[0027] Example 1

[0028] The present application provides an adjustable inner limit tooling for a thermos cup, which includes a strip-shaped seat body 1, an inner limit assembly 2, a lifting negative pressure positioning assembly 3, a transmission rotation assembly 4, a connecting pipe 5 and a negative pressure generating unit 6.

[0029] according to Figure 1-4A specific embodiment is shown, in which a plurality of inner limit assemblies 2 are arranged in intervals on a strip-shaped seat body 1. The inner limit assemblies 2 are connected with a lifting and lowering negative pressure positioning assembly 3 which is adjusted to be negatively pressure-adsorbed on the inner bottom surface of the cup in a manner that passes through the axis thereof. The inner limit assemblies 2 and the lifting and lowering negative pressure positioning assembly 3 cooperate to adsorb and position the cup and seal the mouth of the cup. The lifting and lowering negative pressure positioning assembly 3 drives the cup to descend and effectively presses the mouth of the cup against the inner support blocking truncated table 22 to effectively seal the mouth of the cup. A transmission rotating assembly 4 is provided in the strip-shaped seat body 1, which can synchronously drive a plurality of inner limit assemblies 2 installed side by side to rotate synchronously. The lifting and lowering negative pressure positioning assembly 3 passes through the axial lower end of the strip-shaped seat body 1 and is connected to the negative pressure generating unit 6 through a connecting pipe 5. The inner limit assembly 2 provided in the present application can ensure the clamping stability of the cup by the inner support limit and the opening surface blocking limit, and further improve the positioning stability by the negative pressure adsorption of the lifting negative pressure positioning assembly 3, and the lifting negative pressure positioning assembly 3 can ensure that the opening of the cup can effectively abut against the inner support blocking truncated table 22 of the inner limit assembly 2 by pulling the cup in the negative pressure adsorption positioning state, thereby ensuring the airtightness of the port blocking. The inner limit assembly 2 can effectively adapt to cups of various sizes through the elastically deformable inner abutment limit and the adaptability of the truncated table seat body to improve its adaptability range. The lifting negative pressure positioning assembly 3 provided in the present application improves the stability of the inner cavity clamping limit by the negative pressure adsorption positioning method. And it can ensure the effectiveness of the blocking by adjusting the clamping position of the cup, so as to avoid the problem of cup cavity contamination during the coating and other processing processes due to the presence of gaps at the cup mouth, and ensure the accuracy of the processing area. The transmission rotation component 4 provided in the present application can drive multiple internal limit components 2 to rotate around their own axes to increase the usable range of the limit tooling in different processing steps, so that it can more effectively assist in completing the uniform coating of the side wall of the cup and other processes.

[0030] Preferably, the inner limit assembly 2 comprises a support column 21, an inner support and blocking truncated cone 22, a rotating bearing 23, a through tube 24, an annular special-shaped airbag 25, a disc 26, an inner support curved rod 27 and an elastic rubber ring 28. Specifically, the support column 21 is rotatably inserted on the strip-shaped seat body 1 through the rotating shaft bearing 23. Preferably, the axial upper end of the support column 21 is connected with an inner support and blocking truncated cone 22 capable of limiting and blocking the cup mouth. Preferably, a through tube 24 is centrally penetrated on the inner support and blocking truncated cone 22. Preferably, an annular special-shaped airbag 25 is sleeved on the part of the through tube 24 above the inner support and blocking truncated cone 22. Preferably, a disc 26 is also sleeved on the through tube 24. Further preferably, a through opening 261 is provided on the disc 26 for the sac part of the annular special-shaped airbag 25 to bulge upward and expand. Preferably, the upper edge of the disk 26 is also circumferentially spaced to support the inner support curved rod 27 that is laterally convex and abuts against the inner side surface of the cup. Preferably, an elastic rubber ring 28 is sleeved on the oblique side wall of the inner support blocking truncated cone 22 to fill and block the gap between the cup supported by it and its side wall surface. The inclined surface constructed by the inner support blocking truncated cone 22 provided in the present application can be adapted to the cup mouths of cups of different sizes to ensure its effectiveness in blocking the cup. The present application provides an elastic rubber ring 28 on the inclined surface of the inner layer blocking truncated cone 22 to further improve the pressure sealing of the opening of the cup against its oblique side surface, thereby ensuring the effect of sealing the inner cavity of the cup. The annular special-shaped airbag 25 provided in the present application can expand and expand the annular surface under the downward pressure of the lifting negative pressure positioning component 3 and abut against the inner wall surface of the cup, thereby further improving the stability of the inner support limit. The inner support curved rod 27 provided in the present application can adapt to the inner cavity size of the cup by centripetal deflection and bending deformation when the cup is mounted on the inner limit assembly 2, so as to effectively abut against the inner wall surface of the cup. The multiple inner support curved rods 27 provided in the present application can be positioned at multiple points in the annular surface to ensure the stability of the inner support abutment and limit.

[0031] Preferably, the lifting negative pressure positioning assembly 3 includes a support plate 31, a hydraulic lifting rod 32, an air guide tube 33 and a negative pressure suction head 34, an inverted L-shaped pressure rod 35 and an annular pressure plate 36. Preferably, the support plate 31 is supported on the top of the through-tube 24. Further preferably, a plurality of hydraulic lifting rods 32 are arranged circumferentially at intervals on the support plate 31. Preferably, the axial upper ends of the plurality of hydraulic lifting rods 32 are connected to the negative pressure suction head 34 to drive the negative pressure suction head 34 to lift and lower. Preferably, the bottom of the negative pressure suction head 34 is also connected to an air guide tube 33 that penetrates the support plate 31 and extends into the through-tube 24. Preferably, an inverted L-shaped pressure rod 35 is provided on the telescopic rod body of the hydraulic lifting rod 32. Further preferably, the axial lower end of the inverted L-shaped pressure rod 35 is also connected to an annular pressure plate 36 movably sleeved on the through tube 24, so that the annular pressure plate 36 can follow the descent of the hydraulic lifting rod 32 to squeeze the part of the annular special-shaped airbag 25 that expands upward, so that the annular airbag between the disc 26 and the inner support blocking truncated cone 22 expands radially outward, so as to effectively abut against the side wall of the cup body. Preferably, the upward convex expansion refers to that the upper annular surface of the annular airbag is also connected to a plurality of outwardly convex auxiliary airbags, so that the auxiliary airbags are located above the disc 26, so that when the annular pressure plate 36 descends and reduces the space between it and the disc 26, the auxiliary airbags are squeezed, so that the gas in the annular airbag increases and the air pressure increases, so that it expands radially outward from the radial outer side that is not blocked by the limit, so as to effectively abut against the inner wall of the cup. The negative pressure suction head 34 provided in the present application can be turned on to form a negative pressure channel when it abuts against the inner bottom surface of the cup, so as to stably adsorb on the inner wall of the cup, thereby driving the cup to descend through the contraction of the hydraulic lifting rod 32, and then the opening of the cup is effectively abutted against the inner layer blocking truncated table 22, ensuring the effectiveness of port blocking. In addition, the contracted hydraulic lifting rod 32 can drive the annular pressure plate 36 to descend and squeeze the annular special-shaped airbag 25, so that it expands radially outward, thereby abutting against the inner wall surface of the cup, further improving the stability of the limit.

[0032] Preferably, the negative pressure suction head 34 includes an adsorption seat body 341, an elastic silicone sleeve 342 and a plug body 343. Further preferably, a through cavity 3411 is opened in the adsorption seat body 341. Specifically, the plug body 343 blocks the through cavity 3411 by limiting the spring 344. Preferably, the upper end surface of the adsorption seat body 341 is also provided with an elastic silicone sleeve 342 that can abut against the inner top surface of the cup. Preferably, the plug body 343 includes a pressure core rod, a blocking block and a guide support rod, the pressure core rod and the blocking block are coaxially connected, and the guide support rod limits the movement direction of the blocking block.

[0033] Preferably, a first accommodating cavity 11 for accommodating the transmission rotating assembly 4 is provided inside the strip-shaped seat body 1. Preferably, the transmission rotating assembly 4 comprises a transmission tooth 41 sleeved on the support column 21, a transmission belt 42 sleeved on a plurality of parallel transmission teeth 41, and a rotating motor 43 capable of driving the transmission belt 42 to rotate.

[0034] Preferably, a plurality of parallel air guide pipes 33 sequentially penetrate the pipe 24 and the support pipe column 21 and communicate with the rotary sealing pipe joint 51 of the connecting pipe 5. Preferably, the rotary sealing pipe joint 51 is installed at the port of the parallel branch pipe 52 of the connecting pipe 5. Further preferably, the parallel branch pipe 52 is connected to the negative pressure generating unit 6 through the confluence main pipe 53.

[0035] The present utility model is not limited to the above optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present utility model. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope of the claims of the present utility model fall within the protection scope of the present utility model. Those skilled in the art should understand that the present utility model specification and its drawings are illustrative and do not constitute limitations on the claims. The protection scope of the present utility model is defined by the claims and their equivalents. Throughout the text, the features guided by "preferably" are only an optional method and should not be understood as having to be set. Therefore, the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. An adjustable inner limit fixture for a thermos cup, comprising a strip-shaped seat body (1) with a plurality of inner limit assemblies (2) arranged in intervals, characterized in that: The inner limit assembly (2) is plugged with a lifting negative pressure positioning assembly (3) which is adjustable and adsorbed on the inner bottom surface of the cup by negative pressure in a manner that passes through the axis thereof, so that the inner limit assembly (2) and the lifting negative pressure positioning assembly (3) cooperate to adsorb and position the cup and seal the cup mouth; A transmission rotation assembly (4) is arranged in the strip-shaped seat body (1) and is capable of synchronously driving a plurality of the inner limit assemblies (2) installed side by side to rotate synchronously; The lifting negative pressure positioning assembly (3) passes through the axial lower end of the strip-shaped seat body (1) and is connected to the negative pressure generating unit (6) via a connecting pipe (5).

2. The adjustable inner limit fixture for the thermos cup according to claim 1, characterized in that: The inner limit assembly (2) comprises a support column (21), an inner support and blocking truncated cone (22) and a rotating bearing (23), wherein: The support column (21) is rotatably inserted on the strip-shaped seat body (1) via the rotating bearing (23), and the axial upper end of the support column (21) is connected to an inner support and blocking truncated cone (22) capable of limiting and sealing the cup mouth.

3. The adjustable inner limit fixture for the thermos cup according to claim 2, characterized in that: A through pipe (24) is centrally provided on the inner support and sealing truncated cone (22). The through-tube (24) is sleeved with a ring-shaped special-shaped air bag (25) on the part of the tube body above the inner support and blocking truncated cone (22), and the through-tube (24) is also sleeved with a disc (26). The disc (26) is provided with a through opening (261) for the bag body of the annular special-shaped air bag (25) to bulge upward and expand; The upper edge of the disk (26) is also circumferentially supported with inner support curved rods (27) that are laterally protruding and rest against the inner side surface of the cup.

4. The adjustable inner limit fixture for the thermos cup according to claim 3, characterized in that: The lifting negative pressure positioning assembly (3) comprises a support plate (31), a hydraulic lifting rod (32), an air guide tube (33) and a negative pressure suction head (34), wherein: The support plate (31) is supported on the top of the through-tube (24), and a plurality of hydraulic lifting rods (32) are arranged at intervals circumferentially on the support plate (31). The axial upper ends of the plurality of hydraulic lifting rods (32) are all connected to the negative pressure suction head (34) to drive the negative pressure suction head (34) to move up and down; The bottom of the negative pressure suction head (34) is also connected to the air guide tube (33) which penetrates the support plate (31) and extends into the through tube (24).

5. The adjustable inner limit fixture for the thermos cup according to claim 4, characterized in that: An inverted L-shaped pressure rod (35) is provided on the telescopic rod body of the hydraulic lifting rod (32), and the axial lower end of the inverted L-shaped pressure rod (35) is also connected to an annular pressure plate (36) movably sleeved on the through-tube (24).

6. The adjustable inner limit fixture for the thermos cup according to claim 5, characterized in that: The negative pressure suction head (34) comprises an adsorption seat (341), an elastic silicone ring (342) and a plug (343), wherein: A through cavity (3411) is provided in the adsorption seat body (341), and the plug body (343) blocks the through cavity (3411) by limiting the position of the spring (344); The upper end surface of the adsorption seat body (341) is also provided with the elastic silicone ring (342) capable of abutting against the inner top surface of the cup.

7. The adjustable inner limit fixture for the thermos cup according to claim 6, characterized in that: An elastic rubber ring (28) is sleeved on the oblique side wall of the inner support and sealing truncated cone (22) and is capable of filling and sealing the gap between the cup supported by the inner support and the side wall surface.

8. The adjustable inner limit fixture for the thermos cup according to claim 7, characterized in that: In the A first accommodating chamber (11) for accommodating the transmission rotating assembly (4) is provided inside the strip-shaped seat body (1).

9. The adjustable inner limit fixture for the thermos cup according to claim 8, characterized in that: The transmission rotating assembly (4) comprises a transmission tooth (41) sleeved on the supporting column (21), a transmission belt (42) sleeved on a plurality of the transmission teeth (41) arranged side by side, and a rotating motor (43) capable of driving the transmission belt (42) to rotate.

10. The adjustable inner limit fixture for a thermos cup according to claim 9, characterized in that: A plurality of parallel air guide pipes (33) sequentially penetrate the penetration pipe (24) and the support pipe column (21) and are connected to the rotary sealing pipe joint (51) of the connecting pipe (5); The rotary sealing joint (51) is installed at the port of the parallel branch pipe (52) of the connecting pipe (5), and the parallel branch pipe (52) is connected to the negative pressure generating unit (6) through the converging main pipe (53).

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