CN101920283A - Circular pressing device of pressure-bearing solar water heater heat collection plate - Google Patents
Circular pressing device of pressure-bearing solar water heater heat collection plate Download PDFInfo
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- CN101920283A CN101920283A CN 201010226850 CN201010226850A CN101920283A CN 101920283 A CN101920283 A CN 101920283A CN 201010226850 CN201010226850 CN 201010226850 CN 201010226850 A CN201010226850 A CN 201010226850A CN 101920283 A CN101920283 A CN 101920283A
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- solar water
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- 238000003825 pressing Methods 0.000 title claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 230000002787 reinforcement Effects 0.000 claims description 7
- 230000002950 deficient Effects 0.000 claims description 6
- 239000011265 semifinished product Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 27
- 229910052802 copper Inorganic materials 0.000 abstract description 27
- 239000010949 copper Substances 0.000 abstract description 27
- 238000000034 method Methods 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000012545 processing Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 238000003466 welding Methods 0.000 abstract description 3
- 238000004826 seaming Methods 0.000 abstract 2
- 238000007493 shaping process Methods 0.000 abstract 2
- 230000007547 defect Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 20
- 229910052782 aluminium Inorganic materials 0.000 description 18
- 239000004411 aluminium Substances 0.000 description 14
- 238000010521 absorption reaction Methods 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000011218 segmentation Effects 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910000906 Bronze Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
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- Pressure Welding/Diffusion-Bonding (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention provides a circular pressing device of a pressure-bearing solar water heater heat collection plate, belonging to the field of generation and utilization of heat and mainly overcoming the defects of machine shaping before composition by penetrating a copper pile and the machine shaping before riveting, welding, and the like. The circular pressing device is used for carrying out circular pressing and seaming processing on the pressure-bearing solar water heater heat collection plate, realizing the seaming and the circular pressing of the pressure-bearing solar water heater heat collection plate through a circular pressing wheel set and a detection device without causing any deformation of the branched copper pipe embedded in the heat collection plate or influencing the pressure-bearing capability of the heat collection plate, has better final pressure-bearing effect, greatly enhances the quality of the pressure-bearing solar water heater heat collection plate and has simple processing process; in addition, compared with the traditional process, the invention greatly enhances the automation degree and the fineness degree and can reduce the water leakage proportion of the pressure-bearing solar water heater heat collection plate and the rejection ratio in the production process.
Description
Technical field
The invention belongs to the generation of heat and utilize the field.
Background technology
Flat plate solar water heater extensively adopts aluminium flake and copper pipe compound as the thermal-arrest plate, be formed by connecting by compound heat absorption fin of copper aluminium and copper thermal-collecting tube, the characteristics of this heat absorption fin are by two sides aluminium sheet sandwich copper pipe, roll over combination process by pressing, make between aluminum bronze and the aluminium aluminium combine closely (reaching metallurgical binding basically), carry out utilizing water under high pressure or compressed air the copper pipe inflation moulding of flattening in advance behind the face coat, the thermal resistance of conducting heat is little, thereby has a very high fin efficiency, in addition, the vias inner walls of this heat absorption fin is copper, thereby has corrosion-resistant, advantages such as the life-span is long.
But traditional thermal-arrest plate has only aluminium flake and the two-layer pressure-bearing material of copper pipe, and rolling, the inflation of copper pipe process, and damage to a certain degree can appear in crooked position, the pressure-bearing limit is lower, be applicable to the place that pressure of supply water is lower, there is hidden danger in the percent defective height in the production process.
Some solar water heater enterprises have proposed new pressure-bearing thermal-arrest plate structure, mainly contain two kinds of forms, and a kind of is the first aluminum fin that the aluminium or the copper heat absorbing member of outside are processed into band circular port pipe, and then it is compound to penetrate copper pipe; Another kind is the first fin that the aluminium or the copper heat absorbing member of outside are processed into band semicircle orifice pipe, and is compound with copper pipe by modes such as riveted joint, welding then.
Adopt aluminium alloy to process the aluminum fin of band circular port pipe, then a copper pipe is inserted the Kong Guanzhong of aluminum fin, utilizing the method for mechanical expanding or waterpower expand tube that copper pipe is diffused into again combines closely itself and hole inside pipe wall, form metal heat absorption tube, this structure need diffuse into the copper pipe that penetrates with the hole inside pipe wall and combine closely, can cause copper pipe to produce deformation like this, can influence the bearing capacity of copper pipe.
Equally, earlier the aluminium of outside or copper heat absorbing member are processed into the fin with the semicircle orifice pipe, the mode by riveted joint and welding produces easily stress and concentrates, and the processing technology complexity, causes production cost to increase.
Summary of the invention
The invention provides and a kind ofly to application number be: round belting is pressed in the post processing in the claimed pressure type solar water heater heat-collecting plate production process of the application for a patent for invention of CN201010039126.1; using this device to press circle to receive seam to pressure type solar water heater heat-collecting plate processes; can not cause any deformation to the tributary copper pipe that is embedded with in the aluminium sheet; do not affect its bearing capacity; final pressure-bearing better effects if; quality to the pressure-bearing solar collecting plate has very big lifting; and it is simple to have processing technology; compare with traditional handicraft; automaticity and fine degree greatly improve, and can reduce ratio that collecting plate leaks and the percent defective in the production process.
To achieve these goals, the present invention adopts following technological means:
This device comprises support 1, front rubber tire group 2, rear rubber tire group 3, front pressure circle round group 4 and rear pressure circle round group 5, and front wheel driving motor 6 and rear drive motor 7, front rubber tire group 2, rear rubber tire group 3, front pressure circle round group 4 and rear pressure circle round group 5 are installed on two blocks of side plates of support 1 by its rotating shaft respectively, and the axle center is on the same level line; Two axle center of pressing the circle wheel of each wheels are on same vertical plane, pressing circle wheel profile is the ladder cylinder that the middle part radius is big, the two ends radius is little, the big 0.5-1mm of radius at the radius ratio two ends of mid portion wherein, two distances of pressing circle wheel axle center namely press circle wheel circumference point of contact at a distance of 0.5mm for two for pressing diameter R+ (0.5) mm of circle wheel; Each of front pressure circle round group 4 and rear pressure circle round group 5 presses the big part of the middle part radius of circle wheel along the groove 8 that offers a cross section on the circumference and be " U " type, the DC tube radius that penetrates in the degree of depth of groove 8 and the pressure type solar water heater heat-collecting plate built-in pipe is consistent, is 4.5-5mm;
Press circle to take turns the little part cylinder of two ends radius and be arranged in pressure circle round group 4 and the past both sides extension of rear pressure circle round group 5 each pressure circle wheel middle part " U " groove 8 edge tangent point 10.5mm place, the width of this part cylinder is 12-15mm;
The axle of front wheel driving motor 6 the same rubber tire groups 2 links to each other, and rear drive motor 7 links to each other with the axle of rear pressure circle round group 5.
Obtain penetrating in half-finished pre-pipe laying the tributary pipe of a half-hard state or hard attitude in operations such as, high pressure inflation painted, segmentation cuttings through pressing, compacting reinforcement, rolling, oxidization electrolysis, receiving seam by circular pressing device of pressure-bearing solar water heater heat collection plate of the present invention then handles, make the aluminium strip of soft attitude and pre-pipe laying fit tightly tributary copper pipe outer surface, improve the heat transference efficiency between the two in hard attitude.
In order to improve the precision of pressing round belting, prevent because being out of shape in the pressure type solar water heater heat-collecting plate process in front, and press circle wheel spacing constant, the DC tube that causes the collecting plate built-in pipe and penetrate is not in conjunction with tight, affect heat transfer efficiency, can before the front rubber tire group 2 of this device one stroke switch 9 be set, travel switch 9 connects with the governor motion 10 of the front pressure circle round group 4 of control, controls two spacings of pressing between the circle wheel; The blank position interval 0.5mm of reinforcement is not suppressed in the lower contact point of travel switch 9 and up-to-standard semi-finished product collecting plate built-in pipe both sides, press the collecting plate of round belting the defectives such as flexural deformation to occur if send into, touch travel switch 9, governor motion 10 actions of front pressure circle round group 4, reduce two spacings of pressing between the circle wheel, so that intensified pressure guarantees that aluminium strip and built-in pipe fit tightly; And travel switch 9 connects with time-delay electric control box 11, preestablish the time of time-delay according to the equipment speed of service, after the crushed element of collecting plate is by front pressure circle round group 4, control travel switch 9 resets, governor motion 10 actions of front pressure circle round group 4, press the spacing between the circle wheel to return to normal condition for two, equipment recovers normal operation.By these control measure, can realize the collecting plate of different conditions is pressed circle, enlarged the scope of application, strengthened the antijamming capability of equipment.
Beneficial effect:
A, process pressure round belting of the present invention are received the solar energy pressure-bearing thermal-arrest plate after seam is handled, and have the higher pressure-bearing limit, can reach 0.8MPa, far above the pressure-bearing 0.6MPa of defined among standard GB/T6424-2007;
B, because the pressure circle round group of using pressure round belting of the present invention just to adopt radius to coincide with it for the tributary copper pipe that penetrates is received seam processes, can not cause any deformation to the tributary copper pipe, do not affect its bearing capacity, final pressure-bearing better effects if;
C, pressure of the present invention circle wheel adopt step-like distribution, can utilize and press the bossing of circle wheel need press round position effectively to handle the thermal-arrest plate, handle and adopt pressure circle wheel to go up recessed part for the position that is suppressed with reinforcement, just fix, guarantee that operation is smooth and easy, can not cause damage reinforcement, to the different parts differentiated treatment, can guarantee original shape of product and performance, realize receiving seam again and pressed circle, have a dual effect.
The checkout gear of d, setting of the present invention can effectively guarantee machining accuracy, and the equipment each several part cooperates accurately, can realize the collecting plate of different conditions is pressed circle, has enlarged the scope of application, has strengthened the antijamming capability of equipment.
E, pressure round belting of the present invention are simple to operate, stable, can guarantee the yield rate of thermal-collecting tube, reduce the percent defective in the production process, save production cost greatly.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is the pressure circle wheel construction schematic diagram of pressure round belting of the present invention.
Fig. 3 is the pressure circle wheel sectional view of front pressure circle round group 4 and rear pressure circle round group 5.
The front pressure circle round group of rubber tire group 4-behind the rubber tire group 3-before the 1-support 2-
Pressure circle round group 6-front wheel driving motor 7-rear drive motor behind the 5-
The 8-groove 9-travel switch 10-governor motion 11-electric control box of delaying time
The specific embodiment
As shown in Figure 1, 2, as shown in Figure 1, 2, this device comprises support 1, front rubber tire group 2, rear rubber tire group 3, front pressure circle round group 4 and rear pressure circle round group 5, and front wheel driving motor 6 and rear drive motor 7, wherein the pressure of front pressure circle round group 4 and rear pressure circle round group 5 circle wheel radius is 100mm, front rubber tire group 2, rear rubber tire group 3, front pressure circle round group 4 and rear pressure circle round group 5 are installed on two blocks of side plates of support 1 by its rotating shaft respectively, and the axle center is on the same level line; Two axle center of pressing the circle wheel of each wheels are on same vertical plane, and pressing circle wheel profile is the ladder post that the middle part radius is big, the two ends radius is little, and two are pressed the distance in circle wheel axle center is 200.5mm, namely press circle wheel circumference point of contact at a distance of 0.5mm for two; Each of front pressure circle round group 4 and rear pressure circle round group 5 presses the big part of the middle part radius of circle wheel along the groove 8 that offers a cross section on the circumference and be semicircle, and the DC tube radius that penetrates in the radius of groove 8 and the pressure type solar water heater heat-collecting plate built-in pipe is consistent;
The radius of pressing circle to take turns two ends radius fraction cylinder is 99mm, and the position is at the past both sides extension 11mm place, semicircle groove 8 circumference point of contacts at pressure circle round group 4 and rear pressure circle round group 5 each pressure circle wheel middle part, and width is 13mm; The axle of front wheel driving motor 6 the same rubber tire groups 2 links to each other, and rear drive motor 7 links to each other with the axle of rear pressure circle round group 5.
The thermal-arrest boards half-finished product that makes is in advance sent into preceding rubber tire group 2, carrying out receiving the first time seam by the preceding pressure circle round group 4 of circular pressing device of pressure-bearing solar water heater heat collection plate handles, make the aluminium strip of soft attitude and the tributary copper pipe outer surface that pre-pipe laying is fitted in hard attitude, then by the thrust of front wheel driving motor 6, the thermal-arrest plate is sent into back pressure circle round group 5 carry out receiving the second time seam processing, make aluminium strip and pre-pipe laying fit tightly tributary copper pipe outer surface in hard attitude, thereby obtain good heat transfer and pressure-bearing effect, through pressure testing, the bearing capacity of this thermal-arrest plate is 0.75Mpa.
As shown in Figure 1, 2, this device comprises support 1, front rubber tire group 2, rear rubber tire group 3, front pressure circle round group 4 and rear pressure circle round group 5, and front wheel driving motor 6 and rear drive motor 7, wherein the pressure of front pressure circle round group 4 and rear pressure circle round group 5 circle wheel radius is 150mm, front rubber tire group 2, rear rubber tire group 3, front pressure circle round group 4 and rear pressure circle round group 5 are installed on two blocks of side plates of support 1 by its rotating shaft respectively, and the axle center is on the same level line; Two axle center of pressing the circle wheel of each wheels are on same vertical plane, and pressing circle wheel profile is the ladder post that the middle part radius is big, the two ends radius is little, and two are pressed the distance in circle wheel axle center is 300.5mm, namely press circle wheel circumference point of contact at a distance of 0.5mm for two; Each of front pressure circle round group 4 and rear pressure circle round group 5 presses the big part of the middle part radius of circle wheel along the groove 8 that offers a cross section on the circumference and be semicircle, and the DC tube radius that penetrates in the radius of groove 8 and the pressure type solar water heater heat-collecting plate built-in pipe is consistent;
The radius of pressing circle to take turns two ends radius fraction cylinder is 149.2mm, and the position is at the past both sides extension 10.5mm place, semicircle groove 8 circumference point of contacts at pressure circle round group 4 and rear pressure circle round group 5 each pressure circle wheel middle part, and width is 12mm; The axle of front wheel driving motor 6 the same rubber tire groups 2 links to each other, and rear drive motor 7 links to each other with the axle of rear pressure circle round group 5.
Before the front rubber tire group 2 of this device one stroke switch 9 is set, travel switch 9 connects with the governor motion 10 of the front pressure circle round group 4 of control, controls two spacings of pressing between the circle wheel; The blank position interval 0.5mm of reinforcement is not suppressed in the lower contact point of travel switch 9 and up-to-standard semi-finished product collecting plate built-in pipe both sides, press the collecting plate of round belting the defectives such as flexural deformation to occur if send into, touch travel switch 9, governor motion 10 actions of front pressure circle round group 4, reduce two spacings of pressing between the circle wheel, so that intensified pressure guarantees that aluminium strip and built-in pipe fit tightly; And travel switch 9 connects with time-delay electric control box 11, the time that preestablishes time-delay according to the equipment speed of service is S, after the crushed element of collecting plate is by front pressure circle round group 4, control travel switch 9 resets, governor motion 10 actions of front pressure circle round group 4, press the spacing between the circle wheel to return to normal condition for two, equipment recovers normal operation.
Obtain penetrating in half-finished pre-pipe laying the tributary pipe of a half-hard state or hard attitude in operations such as, high pressure inflation painted, segmentation cuttings through pressing, compacting reinforcement, rolling, oxidization electrolysis, receiving seam by circular pressing device of pressure-bearing solar water heater heat collection plate of the present invention then handles, make the aluminium strip of soft attitude and pre-pipe laying fit tightly tributary copper pipe outer surface in hard attitude, improve the heat transference efficiency between the two, through pressure testing, the bearing capacity of this thermal-arrest plate is 0.8Mpa.
Claims (2)
1. circular pressing device of pressure-bearing solar water heater heat collection plate, it is characterized in that, this device comprises support 1, preceding rubber tire group 2, back rubber tire group 3, preceding pressure circle round group 4 and back pressure circle round group 5, and front wheel driving motor 6 and rear drive motor 7, preceding rubber tire group 2, back rubber tire group 3, preceding pressure circle round group 4 and back pressure circle round group 5 are installed on two blocks of side plates of support 1 by its rotating shaft respectively, and the axle center is on the same horizontal line; Two axle center of pressing the circle wheel of each wheels are on same vertical plane, pressing circle wheel profile is the ladder cylinder that the middle part radius is big, the two ends radius is little, the big 0.5-1mm of radius at the radius ratio two ends of mid portion wherein, two distances of pressing circle wheel axle center promptly press circle wheel circumference point of contact at a distance of 0.5mm for two for pressing diameter R+ (0.5) mm of circle wheel; Before each of pressure circle round group 4 and back pressure circle round group 5 press the big part of the middle part radius of circle wheel to be the groove 8 of " U " type along offering a cross section on the circumference, the DC tube radius that penetrates in the degree of depth of groove 8 and the pre-pipe laying of pressure type solar water heater heat-collecting plate is consistent, is 4.5-5mm;
Press circle to take turns the little part cylinder of two ends radius and be arranged in pressure circle round group 4 and the past both sides extension of rear pressure circle round group 5 each pressure circle wheel middle part " U " groove 8 edge tangent point 10.5mm place, the width of this part cylinder is 12-15mm;
The axle of front wheel driving motor 6 the same rubber tire groups 2 links to each other, and rear drive motor 7 links to each other with the axle of rear pressure circle round group 5.
2. a kind of circular pressing device of pressure-bearing solar water heater heat collection plate according to claim 1, it is characterized in that, before the preceding rubber tire group 2 of this pressure round belting one stroke switch 9 is set, travel switch 9 connects with the governor motion 10 of the preceding pressure circle round group 4 of control, controls two spacings of pressing between the circle wheel; The blank position that reinforcement is not suppressed in the following contact point of travel switch 9 and the up-to-standard pre-pipe laying of semi-finished product thermal-arrest plate both sides is 0.5mm at interval, press the thermal-arrest plate of round belting diastrophic defective to occur when occurring sending into, touch travel switch 9, governor motion 10 actions of preceding pressure circle round group 4, reduce two spacings of pressing between the circle wheel, intensified pressure; Travel switch 9 connects with time-delay electric control box 11, preestablish the time of time-delay according to the equipment speed of service, the crushed element of thermal-arrest plate by preceding pressure circle round group 4 after, control travel switch 9 resets, governor motion 10 actions of preceding pressure circle round group 4, press the spacing between the circle wheel to return to normal condition for two, equipment recovers normal operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102268505A CN101920283B (en) | 2010-07-15 | 2010-07-15 | Circular pressing device of pressure-bearing solar water heater heat collection plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102268505A CN101920283B (en) | 2010-07-15 | 2010-07-15 | Circular pressing device of pressure-bearing solar water heater heat collection plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101920283A true CN101920283A (en) | 2010-12-22 |
| CN101920283B CN101920283B (en) | 2012-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102268505A Expired - Fee Related CN101920283B (en) | 2010-07-15 | 2010-07-15 | Circular pressing device of pressure-bearing solar water heater heat collection plate |
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| Country | Link |
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| CN (1) | CN101920283B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949889A (en) * | 2014-05-14 | 2014-07-30 | 于法周 | Tapping and round-pressing device |
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| US3794803A (en) * | 1971-04-21 | 1974-02-26 | J Valdeck | Apparatus and method for making needle tubing |
| CN2362611Y (en) * | 1998-12-09 | 2000-02-09 | 中国石油天然气总公司工程技术研究院 | Shaping device for polymer lining pipe |
| JP2000167607A (en) * | 1998-12-08 | 2000-06-20 | Sanyo Special Steel Co Ltd | Device for removing oil on inner surface of cold pilger mill product |
| CN2470042Y (en) * | 2001-03-22 | 2002-01-09 | 严锦璇 | Continuous one-time pipe-forming supersonic soldering device for multilayer composite aluminium-plastic soft pieces |
| RU2254189C1 (en) * | 2004-02-03 | 2005-06-20 | ОАО "Синарский трубный завод" | Apparatus for cooling tubes in multistand rolling mill |
| CN201823795U (en) * | 2010-07-15 | 2011-05-11 | 玉溪市兴红太阳能设备有限公司 | Circular pressing device for pressure-bearing heat collecting plate of solar water heater |
-
2010
- 2010-07-15 CN CN2010102268505A patent/CN101920283B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3794803A (en) * | 1971-04-21 | 1974-02-26 | J Valdeck | Apparatus and method for making needle tubing |
| JP2000167607A (en) * | 1998-12-08 | 2000-06-20 | Sanyo Special Steel Co Ltd | Device for removing oil on inner surface of cold pilger mill product |
| CN2362611Y (en) * | 1998-12-09 | 2000-02-09 | 中国石油天然气总公司工程技术研究院 | Shaping device for polymer lining pipe |
| CN2470042Y (en) * | 2001-03-22 | 2002-01-09 | 严锦璇 | Continuous one-time pipe-forming supersonic soldering device for multilayer composite aluminium-plastic soft pieces |
| RU2254189C1 (en) * | 2004-02-03 | 2005-06-20 | ОАО "Синарский трубный завод" | Apparatus for cooling tubes in multistand rolling mill |
| CN201823795U (en) * | 2010-07-15 | 2011-05-11 | 玉溪市兴红太阳能设备有限公司 | Circular pressing device for pressure-bearing heat collecting plate of solar water heater |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103949889A (en) * | 2014-05-14 | 2014-07-30 | 于法周 | Tapping and round-pressing device |
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| Publication number | Publication date |
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| CN101920283B (en) | 2012-03-07 |
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