CN113926947B - Numerical control tube expander special for condenser heat exchange tube - Google Patents
Numerical control tube expander special for condenser heat exchange tube Download PDFInfo
- Publication number
- CN113926947B CN113926947B CN202111253306.4A CN202111253306A CN113926947B CN 113926947 B CN113926947 B CN 113926947B CN 202111253306 A CN202111253306 A CN 202111253306A CN 113926947 B CN113926947 B CN 113926947B
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- vertical plate
- sleeve
- plate
- expansion joint
- transverse plate
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- 230000005540 biological transmission Effects 0.000 claims abstract description 19
- 230000033001 locomotion Effects 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 9
- 230000002457 bidirectional effect Effects 0.000 claims description 12
- 238000005057 refrigeration Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D53/00—Making other particular articles
- B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
- B21D53/06—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of metal tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D41/00—Application of procedures in order to alter the diameter of tube ends
- B21D41/02—Enlarging
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D43/00—Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles; Associations therewith of cutting devices
- B21D43/003—Positioning devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention relates to a special numerical control tube expander for condenser heat exchange tubes, which comprises a base, two baffles respectively fixedly arranged on two sides of the base and a transverse plate arranged above the base, wherein a vertical plate and a vertical plate are vertically fixed on the transverse plate, an expansion joint piece is movably arranged between the vertical plate and the vertical plate through a thread driving mechanism, the thread driving mechanism is used for driving the expansion joint piece to move towards or away from the vertical plate to do linear motion, a transmission mechanism connected with the thread driving mechanism is also arranged between the vertical plate and the vertical plate, the transmission mechanism is used for driving the expansion joint piece to rotate in the linear motion process, the transverse plate is movably arranged above the base through a lifting mechanism, the lifting mechanism is used for driving the transverse plate to vertically ascend or descend, and a user can control a numerical control box through the mutual coordination between each mechanism and each part without excessive manual intervention, so that the safety and the working efficiency are improved.
Description
Technical Field
The invention belongs to the technical field of refrigeration equipment manufacturing, and particularly relates to a numerical control tube expander special for a condenser heat exchange tube.
Background
A Condenser, which is a component of a refrigeration system, is a type of heat exchanger that converts a gas or vapor into a liquid and transfers heat from a tube to the air in the vicinity of the tube in a rapid manner. The condenser operation is exothermic, so the condenser temperature is high.
The heat exchange tube and the tube plate are connected by expansion joint, welding, expansion welding and other methods, and the expansion joint method can be divided into mechanical expansion joint, hydraulic expansion joint, rubber expansion joint, explosion expansion joint and other methods, and currently, when expansion joint is carried out, the operation is usually carried out by a hand-held instrument of a worker, so that the safety is insufficient, the workload is large, the working efficiency is low, and the ideal using effect cannot be achieved.
Disclosure of Invention
The invention mainly solves the technical problems existing in the prior art and provides a numerical control tube expander special for a condenser heat exchange tube.
The technical problems of the invention are mainly solved by the following technical proposal: a special numerical control tube expander for a condenser heat exchange tube comprises a base, two baffles respectively fixedly installed on two sides of the base and a transverse plate arranged above and parallel to the base;
a riser and a riser are vertically fixed on the transverse plate, the riser is used for placing a condenser heat exchange tube, an expansion joint piece is movably arranged between the riser and the riser through a thread driving mechanism, and the thread driving mechanism is used for driving the expansion joint piece to do linear motion towards or away from the riser;
a transmission mechanism connected with the thread driving mechanism is further arranged between the vertical plate and the vertical plate, and the transmission mechanism is used for driving the expansion joint piece to rotate in the process of doing linear motion;
The transverse plate is movably arranged above the base through a lifting mechanism, and the lifting mechanism is used for driving the transverse plate to vertically ascend or descend.
As a further scheme of the invention: the screw thread driving mechanism comprises a translation component arranged on the vertical plate and a sliding structure arranged between the vertical plate and the vertical plate, and the sliding structure is used for guiding the linear motion of the expansion joint;
the translation assembly comprises a screw rod rotatably arranged on one side of the vertical plate, a sleeve sleeved on the periphery of the screw rod, and a first driving motor arranged on the other side of the vertical plate;
The output end of the first driving motor is connected with one end, far away from the riser, of the screw rod, the expansion joint piece is rotatably installed on one end, close to the riser, of the sleeve, and the sleeve is in threaded fit with the screw rod.
As still further aspects of the invention: the sliding structure comprises a transverse rod fixedly installed between the vertical plate and parallel to the transverse plate, and a sleeve arranged on the transverse rod in a sliding manner, and the sleeve is fixedly connected with the sleeve.
As still further aspects of the invention: the transmission mechanism comprises a rotating shaft rotatably arranged between the vertical plate and the vertical plate, and a sleeve shaft sleeved on the rotating shaft in a sliding way through a limiting structure, a second gear is fixed on the periphery of the sleeve shaft, and a first gear meshed with the second gear is fixed on the rotating shaft of the expansion joint piece;
The central axes of the rotating shaft and the sleeve shaft are coincident, the rotating shaft is connected with the screw rod through a transmission belt, and the sleeve shaft is rotationally connected with the sleeve.
As still further aspects of the invention: the limiting structure comprises two protruding strips arranged on the outer wall of the rotating shaft and two limiting grooves arranged on the inner wall of the sleeve shaft, and the limiting grooves are matched with the protruding strips.
As still further aspects of the invention: the lifting mechanism comprises a bidirectional screw rod rotatably arranged between the two baffles, a guide rod fixed between the two baffles and parallel to the bidirectional screw rod, and two moving plates symmetrically arranged on the bidirectional screw rod;
the movable plate is connected with the bottom of the transverse plate through two groups of crossed structures, and a second driving motor for driving the bidirectional screw rod to rotate is arranged on the side part of one baffle plate.
As still further aspects of the invention: the cross structure comprises a first supporting rod and a second supporting rod which are connected with the movable plate and the transverse plate, wherein the first supporting rod and the second supporting rod form an X shape, one end of the first supporting rod and one end of the second supporting rod are rotatably connected with the upper part of the movable plate, and the other end of the second supporting rod is rotatably connected with the bottom of the transverse plate.
The invention has the beneficial effects that:
The invention has novel design, when in use, the condenser heat exchange tube is vertically inserted on the vertical plate, the screw thread driving mechanism works forward, the expansion joint piece is driven to do linear motion towards the vertical plate, meanwhile, the screw thread driving mechanism drives the transmission mechanism to move, the transmission mechanism drives the expansion joint piece to rotate, so that the linear motion and self-transmission of the expansion joint piece are simultaneously carried out, after the expansion joint is finished, the screw thread driving mechanism works reversely, the expansion joint piece is driven to reset, when the lifting mechanism works forward, the transverse plate is driven to vertically rise, so that the height of the expansion joint operation platform is raised, and conversely, when the lifting mechanism works reversely, the transverse plate is driven to vertically descend, so that a user can adjust the height of the expansion joint operation platform according to actual requirements, the expansion joint operation platform is more convenient to process, and the user can control the numerical control box through the mutual coordination between each mechanism and the parts without excessive manual intervention, and the safety and the working efficiency are improved.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a numerical control tube expander special for condenser heat exchange tubes;
FIG. 2 is a schematic view of another angle of an embodiment of a numerical control tube expander special for condenser heat exchange tubes;
FIG. 3 is a schematic view of a numerical control tube expander special for condenser heat exchange tubes in a further angular configuration;
FIG. 4 is a disassembled view of a transmission mechanism in one embodiment of a numerical control tube expander special for condenser heat exchange tubes;
fig. 5 is a disassembled view of the lifting mechanism in one embodiment of the digitally controlled tube expander dedicated to the condenser heat exchange tube.
In the figure: 1-a base; 2-baffle plates; 3-a cross plate; 4-inclined plates; 5-risers; 6-a first drive motor; 7-a screw rod; 8-sleeve; 9-expansion joint; 10-a cross bar; 11-a sleeve; 12-rotating shaft; 13-sleeve shaft; 14-projecting strips; 15-a limit groove; 16-a first gear; 17-a second gear; 18-a bidirectional screw rod; 19-a guide bar; 20-moving plate; 21-a first support bar; 22-a second support bar; 23-a second drive motor; 24-vertical plate.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, an element in the present disclosure may be referred to as being "fixed" or "disposed" on another element or being directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Referring to fig. 1 to 5, in an embodiment of the present invention, a digitally controlled tube expander dedicated for a condenser heat exchange tube includes a base 1, two baffles 2 respectively fixedly installed on two sides of the base 1, and a transverse plate 3 disposed above and parallel to the base 1;
a riser 5 and a riser 24 are vertically fixed on the transverse plate 3, the riser 5 is used for placing a condenser heat exchange tube, an expansion joint piece 9 is movably arranged between the riser 24 and the riser 5 through a thread driving mechanism, and the thread driving mechanism is used for driving the expansion joint piece 9 to do linear motion towards or away from the riser 5;
A transmission mechanism connected with the thread driving mechanism is further arranged between the vertical plate 5 and the vertical plate 24, and the transmission mechanism is used for driving the expansion joint 9 to rotate in the process of performing linear motion;
The transverse plate 3 is movably arranged above the base 1 through a lifting mechanism, and the lifting mechanism is used for driving the transverse plate 3 to vertically ascend or descend.
Wherein, it should be noted that the upper part of the transverse plate 3 is also provided with an inclined plate 4, one end of the inclined plate 4 is fixed with the upper part of the transverse plate 3, and the other end is fixed with the top of the vertical plate 5, and is used for stably supporting the vertical plate 5;
in addition, the screw thread actuating mechanism and elevating system's work is controlled by the numerical control case.
In the embodiment of the invention, when the condenser heat exchange tube is used, the condenser heat exchange tube is vertically inserted on the vertical plate 5, the screw thread driving mechanism works in the forward direction to drive the expansion joint piece 9 to do linear motion towards the vertical plate 5, meanwhile, the screw thread driving mechanism drives the transmission mechanism to move, and the transmission mechanism drives the expansion joint piece 9 to rotate so that the linear motion and self-transmission of the expansion joint piece 9 are simultaneously carried out, and after the expansion joint is finished, the screw thread driving mechanism works in the reverse direction to drive the expansion joint piece 9 to reset;
When the lifting mechanism works in the forward direction, the transverse plate 3 is driven to vertically ascend, so that the height of the expansion operation platform is increased, otherwise, when the lifting mechanism works in the reverse direction, the transverse plate 5 is driven to vertically descend, so that a user can adjust the height of the expansion operation platform according to actual requirements, and the expansion operation platform is more convenient to process;
In summary, through the mutual cooperation between each mechanism and the components, a user can control the numerical control box without excessive manual intervention, so that the safety and the working efficiency are improved, and the pipe expander is suitable for popularization and use.
As an embodiment of the present invention, the screw driving mechanism comprises a translation assembly mounted on the riser 24 and a sliding structure arranged between the riser 24 and the riser 5 for guiding the rectilinear movement of the expansion joint 9;
The translation assembly comprises a screw rod 7 rotatably installed on one side of the vertical plate 24, a sleeve 8 sleeved on the periphery of the screw rod 7, and a first driving motor 6 installed on the other side of the vertical plate 24;
The output end of the first driving motor 6 is connected with one end, far away from the riser 5, of the screw rod 7, the expansion joint piece 9 is rotatably installed on one end, close to the riser 5, of the sleeve 8, and the sleeve 8 is in threaded fit with the screw rod 7.
The sliding structure comprises a cross rod 10 fixedly arranged between the vertical plate 5 and the vertical plate 24 and parallel to the transverse plate 3, and a sleeve 11 slidably arranged on the cross rod 10, wherein the sleeve 11 is fixedly connected with the sleeve 8.
In the embodiment of the invention, when the first driving motor 6 drives the screw rod 7 to rotate positively, the screw rod 7 and the sleeve 8 are in threaded fit, the sleeve 8 is guided by the cross rod 10 and the sleeve 11, the sleeve 11 slides on the cross rod 10, the sleeve 8 drives the expansion joint 9 to move linearly towards the riser 5, and otherwise, the expansion joint 9 moves linearly away from the riser 5.
As an embodiment of the invention, the transmission mechanism comprises a rotating shaft 12 rotatably installed between the vertical plate 24 and the vertical plate 5, a sleeve shaft 13 sleeved on the rotating shaft 12 in a sliding way through a limiting structure, a second gear 17 is fixed on the periphery of the sleeve shaft 13, a first gear 16 meshed with the second gear 17 is fixed on the rotating shaft of the expansion joint 9, the central axes of the rotating shaft 12 and the sleeve shaft 13 are coincident, the rotating shaft 12 is connected with the screw rod 7 through a transmission belt, and the sleeve shaft 13 is rotatably connected with the sleeve 8;
the limiting structure comprises two protruding strips 14 arranged on the outer wall of the rotating shaft 12 and two limiting grooves 15 arranged on the inner wall of the sleeve shaft 13, and the limiting grooves 15 are matched with the protruding strips 14.
In the embodiment of the invention, when the screw rod 7 rotates, the rotating shaft 12 is driven to rotate by the driving belt, so that the rotating shaft 12 drives the sleeve shaft 13 to rotate by the protruding strip 14 and the limiting groove 15, and the sleeve shaft 13 drives the expansion joint 9 to rotate by the second gear 17 and the first gear 16, thereby realizing the synchronism of the linear motion and the rotation of the expansion joint 9.
As an embodiment of the present invention, the lifting mechanism comprises a bidirectional screw rod 18 rotatably installed between two baffle plates 2, a guide rod 19 fixed between two baffle plates 2 and parallel to the bidirectional screw rod 18, and two moving plates 20 symmetrically arranged on the bidirectional screw rod 18, wherein the moving plates 20 are connected with the bottom of the transverse plate 3 through two sets of crossing structures, and a second driving motor 23 for driving the bidirectional screw rod 18 to rotate is installed on one side of one baffle plate 2;
The cross structure comprises a first supporting rod 21 and a second supporting rod 22 which are connected with the movable plate 20 and the transverse plate 3, wherein the first supporting rod 21 and the second supporting rod 22 form an X shape, one end of each of the first supporting rod 21 and the second supporting rod is rotatably connected with the upper part of the movable plate 20, and the other end of each of the first supporting rod and the second supporting rod is rotatably connected with the bottom of the transverse plate 3.
Note that, the first driving motor 6 and the second driving motor 23 are servo motors with output ends capable of being driven bidirectionally;
the bidirectional screw rod 18 and the guide rod 19 penetrate through the moving plate 20, and the moving plate 20 is slidably connected with the guide rod 19 and is in threaded fit with the bidirectional screw rod 18.
In the embodiment of the present invention, when the second driving motor 23 drives the bi-directional screw rod 18 to rotate in the forward direction, the two bi-directional screw rods 18 of the two moving plates 20 are in threaded fit and move close to each other, the included angle between the first supporting rod 21 and the second supporting rod 22 changes, so that the transverse plate 3 rises vertically, whereas when the second driving motor 23 drives the bi-directional screw rod 18 to rotate in the reverse direction, the two moving plates 20 move away from each other, so that the height of the transverse plate 3 is reduced.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (4)
1. The numerical control tube expander special for the condenser heat exchange tube is characterized by comprising a base (1), two baffle plates (2) fixedly installed on two sides of the base (1) respectively, and a transverse plate (3) arranged above the base (1) and parallel to the base;
A riser (5) and a riser (24) are vertically fixed on the transverse plate (3), the riser (5) is used for placing a condenser heat exchange tube, an expansion joint (9) is movably arranged between the riser (24) and the riser (5) through a thread driving mechanism, and the thread driving mechanism is used for driving the expansion joint (9) to do linear motion towards or away from the riser (5);
A transmission mechanism connected with the thread driving mechanism is further arranged between the vertical plate (5) and the vertical plate (24), and the transmission mechanism is used for driving the expansion joint (9) to rotate in the process of doing linear motion;
the transverse plate (3) is movably arranged above the base (1) through a lifting mechanism, and the lifting mechanism is used for driving the transverse plate (3) to vertically ascend or descend;
the screw thread driving mechanism comprises a translation component arranged on the vertical plate (24) and a sliding structure arranged between the vertical plate (24) and the vertical plate (5), wherein the sliding structure is used for guiding the linear motion of the expansion joint (9);
the translation assembly comprises a screw rod (7) rotatably installed on one side of the vertical plate (24), a sleeve (8) sleeved on the periphery of the screw rod (7), and a first driving motor (6) installed on the other side of the vertical plate (24);
The output end of the first driving motor (6) is connected with one end, far away from the vertical plate (5), of the screw rod (7), the expansion joint piece (9) is rotatably arranged on one end, close to the vertical plate (5), of the sleeve (8), and the sleeve (8) is in threaded fit with the screw rod (7);
The sliding structure comprises a cross rod (10) fixedly arranged between the vertical plate (5) and the vertical plate (24) and parallel to the transverse plate (3) and a sleeve (11) arranged on the cross rod (10) in a sliding manner, and the sleeve (11) is fixedly connected with the sleeve (8);
The transmission mechanism comprises a rotating shaft (12) rotatably arranged between the vertical plate (24) and the vertical plate (5), a sleeve shaft (13) sleeved on the rotating shaft (12) in a sliding way through a limiting structure, a second gear (17) is fixed on the periphery of the sleeve shaft (13), and a first gear (16) meshed with the second gear (17) is fixed on the rotating shaft of the expansion joint (9);
the central axes of the rotating shaft (12) and the sleeve shaft (13) are coincident, the rotating shaft (12) is connected with the screw rod (7) through a transmission belt, and the sleeve shaft (13) is rotationally connected with the sleeve (8).
2. The numerical control tube expander special for condenser heat exchange tubes according to claim 1, wherein the limiting structure comprises two protruding strips (14) arranged on the outer wall of the rotating shaft (12) and two limiting grooves (15) arranged on the inner wall of the sleeve shaft (13), and the limiting grooves (15) are matched with the protruding strips (14).
3. A digitally controlled tube expander dedicated to condenser heat exchange tubes as claimed in claim 1, wherein said lifting mechanism comprises a bi-directional screw (18) rotatably mounted between two of said baffles (2), a guide bar (19) fixed between two of said baffles (2) and parallel to said bi-directional screw (18), and two moving plates (20) symmetrically disposed on said bi-directional screw (18);
the movable plate (20) is connected with the bottom of the transverse plate (3) through two groups of crossed structures, and a second driving motor (23) for driving the bidirectional screw rod (18) to rotate is arranged on the side part of one baffle plate (2).
4. A numerically controlled tube expander special for condenser heat exchange tubes as claimed in claim 3, wherein the cross structure comprises a first support bar (21) and a second support bar (22) for connecting the movable plate (20) with the transverse plate (3), wherein the first support bar (21) and the second support bar (22) form an "X" shape, one end of each of which is rotatably connected with the upper portion of the movable plate (20), and the other end of each of which is rotatably connected with the bottom of the transverse plate (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111253306.4A CN113926947B (en) | 2021-10-27 | 2021-10-27 | Numerical control tube expander special for condenser heat exchange tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111253306.4A CN113926947B (en) | 2021-10-27 | 2021-10-27 | Numerical control tube expander special for condenser heat exchange tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113926947A CN113926947A (en) | 2022-01-14 |
| CN113926947B true CN113926947B (en) | 2024-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111253306.4A Active CN113926947B (en) | 2021-10-27 | 2021-10-27 | Numerical control tube expander special for condenser heat exchange tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113926947B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202516950U (en) * | 2011-12-02 | 2012-11-07 | 宁波精达成形装备股份有限公司 | Vertical tube expander with weight balancing mechanism |
| CN104226845A (en) * | 2013-06-07 | 2014-12-24 | 珠海格力电器股份有限公司 | Automatic distribution equipment and control method thereof |
| CN112238189A (en) * | 2020-09-27 | 2021-01-19 | 卢昆龙 | Heat exchange pipe reaming device |
| CN113478027A (en) * | 2021-07-26 | 2021-10-08 | 浙江龙华工具有限公司 | High strength mantle fiber machine base structure |
-
2021
- 2021-10-27 CN CN202111253306.4A patent/CN113926947B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202516950U (en) * | 2011-12-02 | 2012-11-07 | 宁波精达成形装备股份有限公司 | Vertical tube expander with weight balancing mechanism |
| CN104226845A (en) * | 2013-06-07 | 2014-12-24 | 珠海格力电器股份有限公司 | Automatic distribution equipment and control method thereof |
| CN112238189A (en) * | 2020-09-27 | 2021-01-19 | 卢昆龙 | Heat exchange pipe reaming device |
| CN113478027A (en) * | 2021-07-26 | 2021-10-08 | 浙江龙华工具有限公司 | High strength mantle fiber machine base structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113926947A (en) | 2022-01-14 |
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