Pneumatic chipping hammer for repairing heat exchanger

Abstract

The utility model discloses a pneumatic shovel blade for repairing a heat exchanger, which comprises a pneumatic component and a shovel blade connected onto the pneumatic component. The pneumatic assembly comprises a handle body internally provided with an air channel, an air channel switch assembly arranged on the handle body, an air cylinder arranged on the handle body, a hammer body arranged in the air cylinder and a connecting assembly used for connecting the scraper knife to the pneumatic assembly. The scraper knife comprises a knife handle, a knife body and a knife head, the knife handle is connected with the pneumatic assembly, and the knife head comprises a first edge and a second edge; the first edge is arc-shaped and protrudes away from the direction of the cutter body. According to the utility model, the digging depth and width are controllable, enough space is provided for welding to supplement welding flux, internal perforation scrapping caused by too deep digging is prevented, the repair welding quality is improved, and the product scrapping risk is reduced; the arc-shaped design of the two first edges and the second edge facilitates shoveling of a shovel blade, and deformation is reduced. Common workers can operate easily, and repair efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of brazing joint cleaning, in particular to an air shovel used for repairing a heat exchanger. Background Art

[0002] In the manufacture of aluminum plate-fin heat exchangers, when gas leakage occurs in the brazed joint, the defect needs to be dug out with a depth of 3-5mm and a width of 5mm, and then repaired by argon arc welding. The seal thickness spacing is only 5.1mm for digging and repairing, and the repair space is limited.

[0003] Reference Figure 1 As shown in the figure, the common scraper 01 is easy to damage the structure around the defect when cutting, causing the fin to deform, and the depth and width of the scraper cannot be controlled, resulting in product damage and reduced rework quality. If the rework scraper is used improperly, it will dig through the internal structure and cause the product to be scrapped. Utility Model Content

[0004] The utility model overcomes the shortcomings of the prior art that the blade head is too sharp and easy to be damaged, and provides an air shovel for heat exchanger repair. To achieve the above purpose, the utility model adopts the following technical solution: an air shovel for heat exchanger repair, which includes: a pneumatic component and a blade, the blade is connected to the pneumatic component, and the pneumatic component is suitable for driving the blade to reciprocate;

[0005] The pneumatic assembly includes a handle body with an air duct disposed therein, an air duct switch assembly disposed on the handle body, a cylinder disposed on the handle body, a hammer disposed in the cylinder, and a connecting assembly for connecting the scraper to the pneumatic assembly;

[0006] The scraper includes a handle, a blade and a blade head, the handle is connected to the pneumatic component, the blade head includes a first edge and a second edge, one end of the first edge is connected to the second edge, and the other end is connected to the blade body, and the end of the second edge away from the first edge is connected to the blade body; the first edge is arc-shaped, and the first edge protrudes away from the blade body.

[0007] In a preferred embodiment of the present invention, the radius of the first side is 80-90 mm, the arc is 30°-40°, and the arc length is 35-45 mm.

[0008] In a preferred embodiment of the present invention, the thickness of the first side increases gradually from an end away from the blade body to an end close to the blade body.

[0009] In a preferred embodiment of the present invention, the second side is in an arc shape, and the second side is concave inwardly toward the blade body.

[0010] In a preferred embodiment of the present invention, the radius of the second side is 80-90 mm, the curvature is 20°-30°, and the tip angle of the cutter head is 45°-55°.

[0011] In a preferred embodiment of the present invention, the thickness of the blade is 4-5 mm.

[0012] In a preferred embodiment of the utility model, the air duct switch assembly includes a pressure handle, a push rod and a blocking ball, one end of the pressure handle is a free end, and the other end is in contact with the push rod, and the blocking ball is arranged below the push rod. When the free end of the pressure handle is not subjected to force, the blocking ball closes the air duct, and when the free end of the pressure handle is pressed downward, the air duct is opened.

[0013] In a preferred embodiment of the utility model, a reset piece is arranged below the blocking ball.

[0014] In a preferred embodiment of the utility model, one end of the air duct is connected to the air inlet end, and the other end is connected to the cylinder.

[0015] In a preferred embodiment of the utility model, the hammer body repeatedly moves in the cylinder under the action of air pressure, hits the handle, and then drives the scraper to reciprocate.

[0016] The utility model solves the defects existing in the background technology, and has the following beneficial effects:

[0017] The depth and width of the digging in the utility model are controllable, which not only provides enough space for welding to replenish solder, but also prevents internal perforation and scrap caused by excessive digging, improves the quality of rework welding, and reduces the risk of product scrapping; the arc design of the two first and second sides facilitates the shoveling of the blade and reduces the deformation. At the same time, sufficient space is provided to release the scraped excess material; the designed blade head reduces the difficulty of digging grooves and the skill requirements for operators, and ordinary workers can easily operate it, thereby improving the efficiency of rework. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying creative work.

[0019] Figure 1 Schematic diagram of a shovel blade in the prior art

[0020] Figure 2It is a front view of a blade of an air shovel used for heat exchanger repair described in one embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of a pneumatic component of an air shovel for heat exchanger repair described in one embodiment of the utility model;

[0022] Figure 4 The utility model is a schematic diagram of a blade of an air shovel used for repairing a heat exchanger according to an embodiment of the utility model.

[0023] The reference numerals are as follows:

[0024] 01-ordinary scraper; 101-pressure handle; 102-air duct; 103-push rod; 104-cylinder; 105-connecting assembly; 106-blocking ball; 107-air source; 108-hammer; 20-handle; 30-blade body; 40-blade head; 401-first side; 402-second side. DETAILED DESCRIPTION

[0025] In order to more clearly understand the above-mentioned purposes, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. These drawings are all simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner. Therefore, they only show the structures related to the utility model. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict.

[0026] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of the present utility model, unless otherwise specified, "multiple" means two or more.

[0027] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood by specific circumstances.

[0028] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0029] An air shovel for heat exchanger repair, combined with Figure 2 and Figure 3 As shown, it includes: a pneumatic component and a blade, the blade is connected to the pneumatic component, and the pneumatic component is suitable for driving the blade to reciprocate.

[0030] The pneumatic assembly includes a handle body with an air duct 102 disposed therein, an air duct switch assembly disposed on the handle body, a cylinder 104 disposed on the handle body, a hammer 108 disposed in the cylinder 104, and a connecting assembly 105 for connecting the scraper to the pneumatic assembly.

[0031] The air duct switch assembly includes a pressure handle 101, a push rod 103 and a blocking ball 106. One end of the pressure handle 101 is a free end, and the other end is in contact with the push rod 103. The blocking ball 106 is arranged below the push rod 103. When the free end of the pressure handle 101 is not subjected to force, the blocking ball 106 closes the air duct. When the free end of the pressure handle 101 is pressed downward, the air duct is opened. A reset member is arranged below the blocking ball 106, and the reset member can be a spring. When the force on the free end of the pressure handle 101 disappears, the reset member lifts up the blocking ball 106, so that it blocks the air duct 102 and prevents air intake. One end of the air duct is connected to the air inlet end, and the other end is connected to the cylinder 104. Under the action of air pressure, the hammer 108 repeatedly moves in the cylinder 104, hits the shovel, and then drives the shovel to reciprocate.

[0032] Through practical experience, when the air source 107 of the pneumatic scraper is set to 3-6 bar, the pneumatic scraper has the best running speed and force, the least damage to the product structure, and the highest scraping efficiency. By adjusting the hand-held angle and observing the digging depth, a repair groove with a digging depth of 3-5mm and a digging width of 5mm can be obtained.

[0033] like Figure 2As shown, the blade head 40 includes a first edge 401 and a second edge 402. One end of the first edge 401 is connected to the second edge 402, and the other end is connected to the blade body 30. The end of the second edge 402 away from the first edge 401 is connected to the blade body 30. The intersection of the first edge 401 and the second edge 402 is the blade tip.

[0034] Combination Figure 2 and Figure 4 As shown, the first side 401 is in an arc shape, the first side 401 is convex away from the blade body 30, and the tangent of any point of the arc of the first side 401 is located outside the blade head 40. The radius of the first side 401 is 80-90mm, the arc is 30°-40°, and the arc length is 35-45mm. The thickness of the first side 401 increases from the end away from the blade body 30 to the end close to the blade body 30. The tip of the arc is 10-14mm away from the outer edge of the blade wall, and the arc segment is 35-45mm long. With the first side 401 as the force fulcrum, the digging depth of the shovel can be adjusted by adjusting the holding angle of the shovel.

[0035] The second side 402 is in an arc shape, and the second side 402 is concave toward the blade body 30. The radius of the second side 402 is 80-90 mm, and the arc is 20°-30°, ensuring that the tip angle of the blade head 40 is 45°-55°. This makes it easier for the blade to shovel in and reduce deformation, while providing sufficient space to release the scraped excess material.

[0036] The thickness of the blade 30 is 4-5 mm. It is designed based on the 5.1 mm rework spacing of the defect position, and is used to control the width of the defect removal while preventing damage to the adjacent position of the defect.

[0037] The depth and width of the digging in the utility model are controllable, which not only provides enough space for welding to replenish solder, but also prevents internal perforation and scrap caused by excessive digging, improves the quality of rework welding, and reduces the risk of product scrapping; the arc design of the two first sides 401 and the second side 402 facilitates the shoveling of the blade and reduces the deformation. At the same time, sufficient space is provided to release the scraped excess material; the designed blade head 40 reduces the difficulty of digging grooves and the skill requirements for operators, and ordinary workers can easily operate it, thereby improving the efficiency of rework.

[0038] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. An air shovel for heat exchanger repair, characterized in that: include: A pneumatic assembly and a scraper, the scraper is connected to the pneumatic assembly, and the pneumatic assembly is suitable for driving the scraper to reciprocate; the pneumatic assembly includes a handle body with an air duct inside, an air duct switch assembly arranged on the handle body, a cylinder arranged on the handle body, a hammer arranged in the cylinder, and a connecting assembly for connecting the scraper to the pneumatic assembly; The scraper includes a handle, a blade and a blade head, the handle is connected to the pneumatic component, the blade head includes a first edge and a second edge, one end of the first edge is connected to the second edge, and the other end is connected to the blade body, and the end of the second edge away from the first edge is connected to the blade body; the first edge is arc-shaped, and the first edge protrudes away from the blade body.

2. The air shovel for heat exchanger repair according to claim 1, characterized in that: The radius of the first side is 80-90 mm, the arc is 30°-40°, and the arc length is 35-45 mm.

3. The air shovel for heat exchanger repair according to claim 1, characterized in that: The thickness of the first side increases gradually from an end away from the blade body to an end close to the blade body.

4. The air shovel for heat exchanger repair according to claim 1, characterized in that: The second side is in an arc shape, and the second side is concave inwardly toward the blade body.

5. The air shovel for heat exchanger repair according to claim 4, characterized in that: The radius of the second side is 80-90 mm, the curvature is 20°-30°, and the tip angle of the tool head is 45°-55°.

6. The air shovel for heat exchanger repair according to claim 1, characterized in that: The thickness of the blade is 4-5 mm.

7. The air shovel for heat exchanger repair according to claim 1, characterized in that: The air duct switch assembly includes a pressure handle, a push rod and a blocking ball. One end of the pressure handle is a free end, and the other end is in contact with the push rod. The blocking ball is arranged below the push rod. When the free end of the pressure handle is not subjected to force, the blocking ball closes the air duct. When the free end of the pressure handle is pressed downward, the air duct is opened.

8. The air shovel for heat exchanger repair according to claim 7, characterized in that: A reset piece is arranged below the blocking ball.

9. The air shovel for heat exchanger repair according to claim 1, characterized in that: One end of the air duct is connected to the air inlet end, and the other end is connected to the cylinder.

10. The air shovel for heat exchanger repair according to claim 1, characterized in that: The hammer moves repeatedly in the cylinder under the action of air pressure, hits the tool handle, and then drives the scraper to reciprocate.

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