CN210919706U - Pressure maintaining device - Google Patents

Pressure maintaining device Download PDF

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Publication number
CN210919706U
CN210919706U CN201921433802.6U CN201921433802U CN210919706U CN 210919706 U CN210919706 U CN 210919706U CN 201921433802 U CN201921433802 U CN 201921433802U CN 210919706 U CN210919706 U CN 210919706U
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China
Prior art keywords
assembly
pressure maintaining
pressure
conveying
pressurizer
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CN201921433802.6U
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Chinese (zh)
Inventor
刘二源
郭鹏玺
贾月明
贾换小
李彦宁
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Inner Mongolia Chuangwei Intelligent Technology Co ltd
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Inner Mongolia Chuangwei Intelligent Technology Co ltd
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Abstract

The utility model discloses a pressurizer relates to pressfitting technical field. The pressure maintaining device comprises a conveying component and a pressure maintaining component, wherein the conveying component is used for bearing and conveying workpieces; the pressure maintaining assembly is arranged above the conveying assembly and can lift relative to the conveying assembly; the pressurize subassembly includes mounting panel and a plurality of parallel pressure heads that set up, the pressure head is rectangular shape, and with the connection can be dismantled to the mounting panel. The conveying assembly is arranged in the pressure maintaining device, and can be applied to conveying workpieces to be subjected to pressure maintaining in a production line, so that a pressure maintaining process is connected into the production line in series, online pressure maintaining is realized, and the production efficiency is improved; the pressure head is detachably connected with the mounting plate, so that the pressure heads with different sizes can be conveniently replaced, and the compatibility of the pressure maintaining device is improved; the pressure head is rectangular shape, can reduce the quantity of pressure head, convenient debugging.

Description

Pressure maintaining device
Technical Field
The utility model relates to a pressfitting technical field especially relates to a pressurizer.
Background
The backlight module is an important component of display equipment such as a television and the like. The backlight module comprises a back plate and a light bar fixed on the back plate. In the prior art, the light bar is generally adhered and fixed on the back plate in a dispensing manner, and in order to improve the fixing effect, the light bar and the back plate need to be maintained for a period of time.
At present, the conventional operation mode for maintaining the pressure of the lamp strip is to take the television backboard down from the production line through an operator, put the television backboard into the offline lamp strip pressure maintaining device for maintaining the pressure, and put the television backboard onto the production line for continuous processing after maintaining the pressure. This mode operating procedure is many, consumes the manpower, and inefficiency causes output low to jumbo size product pressure head reaches fifty more, when daily change quick-witted debugging, the pressure head is low to the compatibility of unidimensional product, changes a product and just must debug once, and complex operation is very unfavorable for flow production line.
Therefore, a pressure maintaining device is needed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a pressurizer can be online to the lamp strip pressurize, and the part is less, and the debugging is convenient.
To achieve the purpose, the utility model adopts the following technical proposal:
a pressurizer comprising:
the conveying assembly is used for bearing and conveying workpieces; and
the pressure maintaining assembly is arranged above the conveying assembly and can lift relative to the conveying assembly;
the pressurize subassembly includes:
mounting a plate; and
a plurality of parallel pressure heads that set up, the pressure head is rectangular shape, and with the connection can be dismantled to the mounting panel.
Wherein, the pressure head is fixed on the mounting plate in an adsorption manner.
Wherein, the pressurize subassembly still includes:
the adsorption piece, the adsorption piece with the pressure head is connected, the adsorption piece can adsorb in on the mounting panel.
Wherein, the adsorption piece is an electromagnetic switch or a vacuum chuck.
Wherein, the pressurize subassembly still includes:
one end of the connecting rod is connected with the adsorption piece, and the other end of the connecting rod is connected with the pressure head; and
the first elastic piece, the one end butt of first elastic piece the absorption piece or the mounting panel, the other end butt the pressure head, first elastic piece is configured as downwards to support pressing the pressure head.
Wherein, the pressurizer still includes:
a frame;
the lifting assembly is arranged on the machine frame and is configured to drive the pressure maintaining assembly to lift; and
the guide assembly is arranged on the rack and connected with the pressure maintaining assembly.
Wherein, the pressurizer still includes:
and one end of the universal component is connected with the lifting component, and the other end of the universal component is connected with the pressure maintaining component.
Wherein, the pressurizer still includes:
and one end of the second elastic member is connected with the frame, the other end of the second elastic member is connected with the pressure maintaining assembly, and the second elastic member is configured to drive the pressure maintaining assembly to ascend.
Wherein, the pressurizer still includes:
a stop assembly configured to position the workpiece on the transport assembly.
Wherein, the pressurizer still includes:
the elastic pad is arranged on the conveying assembly and used for bearing the workpiece.
Has the advantages that: the utility model provides a pressurizer. The conveying assembly is arranged in the pressure maintaining device, and can be applied to conveying workpieces to be subjected to pressure maintaining in a production line, so that a pressure maintaining process is connected into the production line in series, online pressure maintaining is realized, and the production efficiency is improved; the pressure head is detachably connected with the mounting plate, so that the pressure heads with different sizes can be conveniently replaced, and the compatibility of the pressure maintaining device is improved; the pressure head is rectangular shape, can reduce the quantity of pressure head, convenient debugging.
Drawings
Fig. 1 is a schematic structural view of a pressurizer according to an embodiment of the present invention;
fig. 2 is a schematic view of a partial structure of a pressurizer according to an embodiment of the present invention.
Wherein:
1. a transfer assembly; 11. a side plate; 12. a roller; 21. a frame body; 22. a mounting seat; 23. a fixing plate; 3. a cylinder; 31. a piston rod; 32. a body; 4. a pressure maintaining component; 41. mounting a plate; 42. a pressure head; 421. an avoidance groove; 43. a connecting rod; 44. an adsorbing member; 5. a guide assembly; 51. a guide shaft; 52. a second elastic member; 6. a gimbal assembly; 7. an elastic pad; 8. a back plate; 9. a light bar.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in direct contact with the second feature but being in contact with the second feature by another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
This embodiment provides a pressurizer, can be used for the pressurize of the back work piece of point gluing to improve fixed effect. The pressure maintaining device can be used for maintaining the pressure of the lamp strip and the back plate in the production process of display equipment such as televisions, and the pressure maintaining device is introduced by taking the pressure maintaining between the lamp strip and the back plate as an example in the embodiment.
Light bars and backplanes are important components in display devices. The lamp strip is fixed on the backplate, and the light that the lamp strip sent forms even area light source behind the optical module to satisfy display device's demonstration function demand. Because the backplate is as display device's outward appearance piece, for making the backplate more pleasing to the eye, the backplate passes through sticky the fixed with the lamp strip, need not trompil on the backplate. For improving the fixed effect of lamp strip and backplate, after backplate or lamp strip surface point were glued, place the lamp strip on the backplate, through exerting certain pressure to the lamp strip, improve the fixed effect of lamp strip and backplate, this process is called the pressurize.
Among the prior art, the pressurize of lamp strip needs to go on off-line, after the pressurize, the manual work again will be fixed with the backplate of lamp strip and put into production line on go on further processing, has seriously influenced machining efficiency, complex operation, the cost of labor is high.
In order to solve the above problem, as shown in fig. 1, the pressure maintaining device provided in this embodiment includes a frame, a conveying assembly 1 and a pressure maintaining assembly 4, wherein the pressure maintaining assembly 4 is disposed above the conveying assembly 1 through the frame. The conveying component 1 is used for bearing and conveying the back plate 8 and the light bar 9 which need pressure maintaining, so that the back plate 8 and the light bar 9 move to the lower part of the pressure maintaining component 4. The pressurize subassembly 4 can be lifted relatively to conveying subassembly 1 to after 8 conveying in place of backplate, support downwards and press on lamp strip 9, thereby to lamp strip 9 and 8 pressurize of backplate.
In this embodiment, pressurizer can go into display device's processing lines in cluster, realizes online pressurize, need not the staff and moves out back row line pressurize under backplate 8 and lamp strip 9, convenient operation, and is efficient, saves the cost of labor.
Alternatively, the conveying assembly 1 may be a roller 12 conveying structure, and may also be a conveying belt structure. In this embodiment, the conveying assembly 1 adopts a roller 12 conveying structure, and specifically includes two side plates 11 arranged oppositely and a plurality of rollers 12 arranged between the two side plates 11, the rollers 12 are rotatably connected with the side plates 11, and the back plate 8 on the rollers 12 is driven to move by rolling of the rollers 12.
In this embodiment, the highest point of the outer peripheral surface of the roller 12 is lower than the top surface of the side plate 11. When backplate 8 was placed on gyro wheel 12, the curb plate 11 that is located backplate 8 both sides can be spacing to backplate 8, avoids backplate 8 to drop by transport assembly 1 in the data send process, improves the stability of conveying.
For realizing the lift of pressurize subassembly 4, the pressurizer still includes lifting unit, and lifting unit fixes in the frame, and lifting unit can drive 4 lifts of pressurize subassemblies. Specifically, the frame includes support body 21 and mount pad 22, and mount pad 22 sets up on support body 21 for the installation lifting unit. The frame body 21 may be a frame structure composed of a cross bar and a vertical bar. In this embodiment, frame construction is the rectangle, including four montants and a plurality of horizontal poles of connecting four montants, and the horizontal pole can improve the holistic stability of support body 21. The bottom end of the vertical rod can be placed on the side plate 11 of the conveying component 1, and the pressure maintaining component 4 is arranged in the frame body 21, so that the pressure maintaining component 4 is positioned above the roller 12. The mounting seat 22 is arranged at the center of the top of the frame body 21, so that the pressure maintaining assembly 4 connected with the lifting assembly is positioned right above the conveying assembly 1, and the pressure maintaining assembly 4 is conveniently aligned with the back plate 8.
In this embodiment, the lifting assembly includes a cylinder 3, and the cylinder 3 is disposed on the mounting seat 22 and is used for driving the pressure maintaining assembly 4 to lift. The lifting is driven by the cylinder 3, the structure is simple, and the cost is low.
In order to control the pressure maintaining pressure, the deformation and the damage of the back plate 8 or the lamp strip 9 caused by overlarge pressure are avoided, and the cylinder 3 can be a double-output-shaft adjustable stroke cylinder 3 so that the lifting stroke of the pressure maintaining assembly 4 can be adjusted. Specifically, the cylinder 3 includes a body 32 and a piston rod 31, both ends of the piston rod 31 extend out of the body 32, one end of the piston rod 31 is connected with a stroke adjusting nut (not shown in the figure) in a threaded manner, and the other end of the piston rod 31 passes through the mounting seat 22 and then is connected with the pressure maintaining assembly 4, and the stroke of the cylinder 3 can be adjusted by adjusting the position of the stroke adjusting nut on the piston rod 31, so that reasonable pressure maintaining pressure can be controlled. Alternatively, the model of the cylinder 3 may be SCJ63 × 300-.
In other embodiments, the lifting assembly may also be a linear motor, a hydraulic cylinder, or a lead screw and nut mechanism driven by a motor, a rack and pinion mechanism, etc.
In order to improve the stability that 4 lifts of pressurize subassembly, the pressurizer still includes guide assembly 5, and guide assembly 5 connects pressurize subassembly 4 and frame for inject the moving direction of pressurize subassembly 4, so that improve the smooth and easy nature that 4 lifts of pressurize subassembly and the positioning accuracy of pressurize subassembly 4 and lamp strip 9.
Alternatively, the guide assembly 5 comprises at least one guide shaft 51, one end of the guide shaft 51 is connected with the pressure maintaining assembly 4, and the other end is slidably inserted through the mounting seat 22. In the process that the lifting assembly drives the pressure maintaining assembly 4 to lift, the guide shaft 51 is in sliding fit with the mounting seat 22 to limit the moving direction of the pressure maintaining assembly 4. The guide shaft 51 may be provided with a plurality of guide shafts, which is advantageous for improving the guide effect.
In other embodiments, the guiding assembly 5 may further include a sliding rail disposed on the frame, and the pressure maintaining assembly 4 is slidably connected to the sliding rail and may also perform a guiding function.
In order to avoid the guide shaft 51 from being locked in the sliding process, the piston rod 31 of the cylinder 3 is connected with the pressure maintaining assembly 4 through the universal assembly 6, so that the rotating angle between the pressure maintaining assembly 4 and the piston rod 31 can be adjusted in a self-adaptive manner, and the guide shaft 51 is prevented from being locked due to the fact that the piston rod 31 deviates in the vertical direction. Alternatively, the universal assembly 6 may be a universal joint, or may be another structure, as long as the spherical hinge between the piston rod 31 and the pressure maintaining assembly 4 is realized.
In order to enable the pressure maintaining assembly 4 to ascend sequentially after the pressure maintaining is finished, the efficiency is improved, the pressure maintaining assembly 4 and the rack can be connected through the second elastic piece 52, and the second elastic piece 52 can drive the pressure maintaining assembly 4 to ascend. Alternatively, the second elastic member 52 may be a spring, which is simple in structure and beneficial to cost saving.
In order to make the structure of the pressure maintaining device simpler and more compact, one end of the second elastic member 52 is connected to the guide shaft 51, and the other end is connected to the frame. Specifically, the frame further includes a fixing plate 23, the fixing plate 23 is located above the mounting seat 22, and the second elastic member 52 connects the fixing plate 23 and the guide shaft 51. When the pressure maintaining component 4 descends and presses against the light bar 9, the second elastic member 52 is in a stretching state, and the cylinder 3 needs to overcome the resistance of the second elastic member 52 to drive the pressure maintaining component 4 to descend. After the pressure maintaining is finished, the cylinder 3 drives the pressure maintaining assembly 4 to ascend, and meanwhile, the elastic restoring force of the second elastic piece 52 can assist in driving the pressure maintaining assembly 4 to ascend, so that the ascending speed of the pressure maintaining assembly 4 is increased.
As shown in fig. 1 and 2, the pressure holding assembly 4 includes a mounting plate 41 and a plurality of pressure heads 42 provided at the bottom of the mounting plate 41, and the top surface of the mounting plate 41 is connected to the guide shaft 51 and the gimbal assembly 6. Because many lamp strips 9 need to be provided with on backplate 8, and lamp strip 9 is rectangular shape, when carrying out the pressurize, need apply even pressure to lamp strip 9 along length direction to improve lamp strip 9 and backplate 8's fixed effect. For this reason, in the prior art, the pressing head 42 is a column having a small cross-sectional area, and a plurality of columns are arranged in a matrix, and each light bar 9 is abutted by a plurality of columns along the length direction thereof. The existing structure of the pressure head 42 causes the pressure head 42 to have more quantity and complicated disassembly and assembly. Aiming at products of different models, the distance between the adjacent pressing heads 42 in the same row needs to be adjusted to avoid the light-emitting elements on the light bars 9, and the distance between the adjacent two rows of pressing heads 42 needs to be adjusted to adapt to the distance between the adjacent light bars 9 on the back plate 8, so that the debugging is complex and the operation is difficult.
In order to solve the above problem, in the present embodiment, the pressing head 42 has a long bar shape, and a plurality of pressing heads 42 are arranged in parallel. When the pressure maintaining device works, the angle of the back plate 8 on the conveying component 1 can be adjusted, so that the extending direction of the light bar 9 is perpendicular to the extending direction of the pressure head 42. The pressure head 42 can support simultaneously and press on a plurality of lamp strips 9, has reduced required pressure head 42 quantity, makes things convenient for the dismouting, and only need adjust the distance between two adjacent pressure heads 42 can in order to dodge the light emitting component on the lamp strip 9, and the debugging is more convenient.
Optionally, the bottom surface of the ram 42 may be further provided with an escape groove 421, and the escape groove 421 extends along the length direction of the ram 42. When the pressure head 42 supports and presses the light bar 9, the light-emitting element on the light bar 9 can be positioned between two adjacent pressure heads 42 and can be positioned in the avoiding groove 421, so that the compatibility of the pressure heads 42 to product models is improved, and debugging can be reduced.
To facilitate removal and adjustment of the distance between adjacent segments of the ram 42, the ram 42 may be attached to the mounting plate 41 by suction. Through adsorbing fixed pressure head 42, need not to set up the structure of fixed pressure head 42 on the mounting panel 41, simple structure, pressure head 42 position adjustment is more nimble.
Specifically, the pressure maintaining assembly 4 further includes an adsorbing member 44, the adsorbing member 44 may be fixed on the pressure head 42, and the adsorbing member 44 is adsorbed on the mounting plate 41 to connect the pressure head 42 and the mounting plate 41. In this embodiment, the adsorbing member 44 may be magnetically adsorbed on the mounting plate 41. For example, the suction member 44 may be an electromagnetic switch, and the mounting plate 41 may be made of a magnetic material. The electromagnetic switch generates a magnetic field when energized, and the magnetic switch can attract the magnetic material and is fixed on the mounting plate 41.
In other embodiments, the suction member 44 may be also sucked on the mounting plate 41 by vacuum, and correspondingly, the suction member 44 may be a vacuum chuck.
In order to enable the pressing head 42 to provide sufficient pressure to the light bar 9, the pressure maintaining assembly 4 may further include a connecting rod 43 and a first elastic member, one end of the connecting rod 43 is connected to the suction member 44, and the other end of the connecting rod is connected to the pressing head 42, so that the positions of the suction member 44 and the pressing head 42 are fixed. One end of the first elastic member abuts against the adsorption member 44 or the mounting plate 41, the other end of the first elastic member abuts against the pressure head 42, and the first elastic member is used for downwards abutting against the pressure head 42, so that the pressure head 42 is guaranteed to have enough pressure on the light bar 9, and the fixing effect of the light bar 9 and the back plate 8 is improved.
Alternatively, the first elastic member may be a spring, and the spring may be sleeved outside the connecting rod 43, so as to simplify the structure of the pressure maintaining assembly 4.
In order to avoid the deformation of the backboard 8 directly contacting with the roller 12 after being pressed, the conveying assembly 1 can be further provided with an elastic pad 7. The elastic pad 7 is positioned between the two side plates 11 and is used for bearing the back plate 8 and buffering the pressure applied to the back plate 8. Alternatively, the elastic pad 7 may be made of rubber or sponge.
To ensure the positioning accuracy of the pressing head 42 and the light bar 9, the position of the back plate 8 needs to be accurate. In this embodiment, the pressure maintaining assembly 4 further includes a limiting assembly, and the limiting assembly is used for positioning the position of the workpiece on the conveying assembly 1. Specifically, the limiting assembly comprises a limiting plate which can be arranged on the frame body 21. After backplate 8 was placed on cushion 7, can be with backplate 8 one side reason and limiting plate butt to the position of limiting plate is as the location benchmark, and the positioning accuracy of lamp strip 9 on pressure head 42 and the backplate 8 can be guaranteed to the position of debugging pressure head 42.
To avoid the limiting plate from affecting the conveying of the backboard 8, the limiting plate may be disposed on the side of the frame body 21 near the side plate 11.
The working process of the pressure maintaining device in the embodiment is as follows:
the conveying assembly 1 conveys the back plates 8 with the light bars 9 one by one to the position under the pressure maintaining assembly 4, and when one back plate 8 is conveyed in place, the conveying assembly 1 pauses to work. One side edge of the backboard 8 is abutted against the limiting plate along the direction vertical to the conveying direction of the conveying assembly 1 through manual work or a pushing mechanism, and the backboard 8 is positioned. The air cylinder 3 is started to drive the pressure maintaining assembly 4 to descend, so that the pressure head 42 abuts against the light bar 9. After the pressure maintaining is carried out for 3-5s, the cylinder 3 returns and is matched with the second spring to enable the pressure maintaining assembly 4 to rise rapidly. The conveying assembly 1 is started, the back plate 8 with pressure maintaining completed is conveyed to the next station, and the back plate 8 with pressure maintaining required is conveyed to the lower part of the pressure maintaining assembly 4, so that the next pressure maintaining operation is carried out.
The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims (10)

1. A pressurizer, comprising:
the conveying assembly (1), the said conveying assembly (1) is used for bearing and conveying the work piece; and
the pressure maintaining assembly (4) is arranged above the conveying assembly (1), and the pressure maintaining assembly (4) can lift relative to the conveying assembly (1);
the pressure maintaining assembly (4) comprises:
a mounting plate (41); and
a plurality of pressure heads (42) that set up in parallel, pressure head (42) are rectangular shape, and with mounting panel (41) can dismantle the connection.
2. The pressurizer of claim 1 wherein the ram (42) is suction fixed to the mounting plate (41).
3. The dwell device according to claim 2, characterized in that the dwell assembly (4) further comprises:
and the adsorption piece (44), the adsorption piece (44) is connected with the pressure head (42), and the adsorption piece (44) can be adsorbed on the mounting plate (41).
4. Pressurizer according to claim 3, characterized in that the suction member (44) is an electromagnetic switch or a vacuum cup.
5. A pressurizer according to claim 3, characterized in that the pressure maintaining assembly (4) further comprises:
the connecting rod (43), one end of the connecting rod (43) is connected with the adsorption piece (44), and the other end is connected with the pressure head (42); and
a first elastic member having one end abutting against the suction member (44) or the mounting plate (41) and the other end abutting against the pressure head (42), the first elastic member being configured to press down against the pressure head (42).
6. The pressurizer of any of claims 1-5, further comprising:
a frame;
the lifting component is arranged on the machine frame and is configured to drive the pressure maintaining component (4) to lift; and
the guide component (5), the guide component (5) set up in the frame, and with pressurize subassembly (4) are connected.
7. The pressurizer of claim 6, further comprising:
the lifting component is connected to one end of the universal component (6), and the pressure maintaining component (4) is connected to the other end of the universal component (6).
8. The pressurizer of claim 6, further comprising:
a second elastic member (52), one end of the second elastic member (52) is connected with the frame, the other end of the second elastic member is connected with the pressure maintaining assembly (4), and the second elastic member (52) is configured to drive the pressure maintaining assembly (4) to ascend.
9. The pressurizer of any of claims 1-4, further comprising:
a stop assembly configured to position the workpiece on the transport assembly (1).
10. The pressurizer of any of claims 1-4, further comprising:
the elastic pad (7), the elastic pad (7) sets up on conveying subassembly (1), elastic pad (7) are used for bearing the weight of the work piece.
CN201921433802.6U 2019-08-30 2019-08-30 Pressure maintaining device Active CN210919706U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921433802.6U CN210919706U (en) 2019-08-30 2019-08-30 Pressure maintaining device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921433802.6U CN210919706U (en) 2019-08-30 2019-08-30 Pressure maintaining device

Publications (1)

Publication Number Publication Date
CN210919706U true CN210919706U (en) 2020-07-03

Family

ID=71365833

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201921433802.6U Active CN210919706U (en) 2019-08-30 2019-08-30 Pressure maintaining device

Country Status (1)

Country Link
CN (1) CN210919706U (en)

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