Grinding treatment device for small-pipe-diameter heat exchange pipe

Abstract

The utility model provides a small-pipe-diameter heat exchange pipe coping treatment device which comprises a cylindrical fixed sleeve with an opening in the left end and a driving handle which is fixedly arranged at the right end of the fixed sleeve and is coaxial with the fixed sleeve, and the driving handle is externally connected with a rotating device. A plurality of outer wall grinding assemblies are arranged on the cylinder wall of the fixed sleeve, an inner wall grinding roller driven by a rotating motor is arranged in the center of the interior of the fixed sleeve, the inner wall grinding roller and the driving handle are coaxial and opposite in rotating direction, the heat exchange pipe is arranged on the inner wall grinding roller in a sleeving mode for use, the rotating device and the rotating motor are started, and the inner wall and the outer wall of the heat exchange pipe are ground at the same time. The small-pipe-diameter heat exchange pipe coping treatment device has the advantages that the inner wall and the outer wall of a heat exchange pipe can be conveniently and rapidly coped, the repeated action of rotating the pipe when a polishing machine is used for coping is reduced, operation can be achieved with one hand, and operation is safe and efficient.

Description

Technical Field

[0001] The utility model relates to the field of grinding devices, in particular to a grinding treatment device for a small-diameter heat exchange tube. Background Art

[0002] The existing heat exchange tubes used in air cooling and evaporative cooling are mostly stainless steel or carbon steel tubes with a diameter of 18mm to 38mm. In order to reduce costs or when there are special requirements, enterprises must use carbon steel heat exchange tubes such as 20# and 16Mn. However, carbon steel heat exchange tubes are very prone to rust when exposed to rain or stored in a humid environment for a long time. The rust in the corroded area has a great impact on the quality of the weld.

[0003] In order to solve the rust problem and ensure the quality of the weld seam of the heat exchange tube, the assembly position of the carbon steel heat exchange tube and the tube sheet must be rust-removed. At present, most of the carbon steel heat exchange tube heads are processed by manual grinding, and very few are processed by professional machinery. Because the cost of professional machinery processing equipment is high and the versatility is poor, it is not suitable for widespread use. Manual grinding is to use an angle grinder + shutter wheel (or polishing disc) to grind the heat exchange tube to remove surface impurities and rust to meet the surface treatment requirements.

[0004] Conventional manual grinding methods using polishing discs can easily produce deep irregular grinding marks on the surface of the heat exchange tube, causing mechanical thinning of the wall thickness of the heat exchange tube, affecting the service life. In addition, manual grinding of small-diameter heat exchange tubes is limited in position and difficult to rotate, making it difficult to perform grinding operations, which increases the difficulty of the operation. The grinding range accuracy is difficult to control when using a manual angle grinder, and the large range deviation affects the grinding quality. When using an angle grinder, both hands are required to hold the machine tightly, and personnel are prone to fatigue during long-term operation, causing safety accidents. In addition, the recovery and control of the flying dust generated by grinding is difficult, which can easily cause environmental impact. Utility Model Content

[0005] The utility model aims to provide a small-diameter heat exchange tube grinding treatment device to solve the problem that small-diameter heat exchange tubes are difficult to grind and that deep irregular grinding marks are easily generated on the surface of the heat exchange tubes after grinding, resulting in mechanical thinning of the heat exchange tube wall thickness and affecting the service life.

[0006] To achieve the above purpose, the utility model provides a small-diameter heat exchange tube grinding and processing device, comprising a cylindrical fixed sleeve with an opening at the left end and a driving handle fixedly arranged at the right end of the fixed sleeve and coaxial with the fixed sleeve, and the driving handle is externally connected to a rotating device;

[0007] A plurality of outer wall grinding assemblies are arranged on the wall of the fixed sleeve, and an inner wall grinding roller driven by a rotating motor is arranged at the inner center of the fixed sleeve. The inner wall grinding roller is coaxial with the driving handle and rotates in opposite directions. The heat exchange tube is sleeved on the inner wall grinding roller for use, and the rotating device and the rotating motor are turned on to grind the inner and outer walls of the heat exchange tube at the same time.

[0008] Furthermore, the outer wall grinding assembly includes a spring sheet with an L-shaped cross-section and sandpaper arranged on the side of the spring sheet; a plurality of through holes are opened on the wall of the fixed sleeve, one end of the outer wall grinding assembly is fixedly connected to the outside of the fixed sleeve, and the other end extends into the interior of the fixed sleeve from the through hole.

[0009] As a preferred solution, the ratio of the friction coefficient of the outer wall grinding assembly to the friction coefficient of the inner wall grinding roller is 1.2 to 1.5.

[0010] As a preferred solution, the lower end of the sandpaper is 10 to 15 mm longer than the lower end of the spring sheet, the outer wall grinding assembly is detachable, and the size of the outer wall grinding assembly is compatible with the size of the heat exchange tube.

[0011] Furthermore, the rotating motor is arranged at the right end of the inner wall grinding roller and fixedly connected to the right end of the inner part of the fixed sleeve, and a bearing is fixedly arranged at the left end of the inner wall grinding roller, and the size of the bearing is adapted to the inner wall grinding roller and the heat exchange tube.

[0012] Furthermore, a fixing bolt is provided at the left end of the inner wall grinding roller to lock the bearing.

[0013] As a preferred solution, the sandpaper is arranged between the spring sheet and the fixed sleeve.

[0014] As a preferred solution, the rotating device is a handheld electric drill.

[0015] As a preferred solution, the number of the outer wall grinding components is 3 to 6.

[0016] The beneficial effects of the utility model are:

[0017] The small-diameter heat exchange tube grinding device can be used to grind the inner and outer walls of the heat exchange tube conveniently and quickly, reducing the repeated action of rotating the tube during grinding by the polishing machine. It can be operated with one hand, which is safe and efficient. Since the grinding operation is carried out in the sleeve, the overflow of dust and splashing is reduced, which is conducive to maintaining a good working environment. Since the grinding sandpaper can be disassembled and replaced, this device can be reused and recycled, reducing the cost of use. The device uses a handheld electric drill as a drive, which can meet the operation in small spaces and complex environments, making up for the limitations of large-scale special grinding machinery on space requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.

[0019] Figure 1 A schematic structural diagram of the utility model.

[0020] Figure 2 A structural schematic diagram of the utility model from another angle.

[0021] The reference numerals in the accompanying drawings are:

[0022] 1. Fixed sleeve; 11. Through hole; 2. Driving handle; 3. Inner wall grinding roller; 4. Rotating motor; 5. Spring sheet; 6. Sandpaper; 7. Bearing; 8. Fixed bolt. DETAILED DESCRIPTION

[0023] To illustrate the features of the present invention, the present invention is further described below with reference to the accompanying drawings and embodiments.

[0024] Example:

[0025] See also Figure 1 and Figure 2 The embodiment of the utility model provides a small-diameter heat exchange tube grinding and processing device, comprising a cylindrical fixed sleeve 1 with an opening at the left end and a driving handle 2 fixedly arranged at the right end of the fixed sleeve 1 and coaxial with the fixed sleeve. The driving handle 2 is externally connected to a rotating device. For the convenience of the operator, the rotating device generally uses a handheld electric drill. ;

[0026] The wall of the fixed sleeve 1 is provided with four outer wall grinding assemblies, and the angle difference between them is 90 degrees. The outer wall grinding assembly includes a spring sheet 5 with an L-shaped cross-section and a sandpaper 6 arranged on the side of the spring sheet. Specifically, the sandpaper 6 is arranged between the spring sheet 5 and the fixed sleeve 1; the wall of the fixed sleeve 1 is provided with a plurality of through holes 11, one end of the outer wall grinding assembly is fixedly connected to the outside of the fixed sleeve 1, and the other end extends into the interior of the fixed sleeve 1 from the through hole 11.

[0027] An inner wall grinding roller 3 driven by a rotating motor 4 is arranged at the inner center of the fixed sleeve 1. The inner wall grinding roller 3 is coaxial with the driving handle 2 and rotates in opposite directions. To ensure that the heat exchange tube itself can be in a state close to relative stillness when the inner and outer grinding devices rotate at the same time, the ratio of the friction coefficient of the outer wall grinding assembly to the friction coefficient of the inner wall grinding roller 3 is set to 1.2 to 1.5, and is adjusted according to actual usage. The heat exchange tube is put on the inner wall grinding roller 3 for use, and the rotating device and the rotating motor 4 are turned on to grind the inner and outer walls of the heat exchange tube at the same time.

[0028] In this embodiment, the lower end of the sandpaper 6 is 15 mm longer than the lower end of the spring sheet 5, so that the sandpaper can grind the outer wall by its own toughness, and will not easily produce deep irregular grinding marks on the surface of the heat exchange tube due to excessive force, resulting in mechanical thinning of the wall thickness of the heat exchange tube. In addition, the protruding length of the sandpaper can be adjusted by adjusting the length of the spring sheet 5, thereby changing the grinding force of the sandpaper 6.

[0029] In addition, the outer wall grinding assembly is detachable. In this embodiment, the outer wall grinding assembly is fixed to the wall of the fixed sleeve 1 by setting fixing bolts on the bending section fixedly connected on the outside. The size of the outer wall grinding assembly is adapted to the size of the heat exchange tube.

[0030] The rotating motor 4 is arranged at the right end of the inner wall grinding roller 3 and fixedly connected to the right end of the inner side of the fixed sleeve 1. A bearing 7 is fixedly arranged at the left end of the inner wall grinding roller 3. The size of the bearing 7 is adapted to the inner wall grinding roller 3 and the heat exchange tube. Specifically, it must meet the requirements of fixing the heat exchange tube and enable the inner wall grinding roller 3 to grind the inner wall of the heat exchange tube. In this embodiment, the bearing 7 is locked by setting a fixing bolt 8 at the left end of the inner wall grinding roller 3.

[0031] The above embodiments and drawings are only used to illustrate the technical solution of the utility model, and are not intended to limit the utility model. The utility model is described in detail with reference to the preferred embodiments. It should be understood by ordinary technicians in this field that the changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the utility model do not deviate from the purpose of the utility model and should also fall within the scope of protection of the claims of the utility model. Other related technical structures not fully disclosed in the utility model are prior art in the field.

Claims

1. A small diameter heat exchange tube grinding treatment device, characterized in that: It comprises a cylindrical fixed sleeve (1) with an opening at the left end, and a driving handle (2) fixedly arranged at the right end of the fixed sleeve (1) and coaxial with the fixed sleeve, wherein the driving handle (2) is externally connected to a rotating device; A plurality of outer wall grinding assemblies are arranged on the wall of the fixed sleeve (1); an inner wall grinding roller (3) driven by a rotating motor (4) is arranged at the center of the fixed sleeve (1); the inner wall grinding roller (3) and the driving handle (2) are coaxial and rotate in opposite directions; the heat exchange tube is sleeved on the inner wall grinding roller (3) for use; the rotating device and the rotating motor (4) are turned on, and the inner wall and the outer wall of the heat exchange tube are simultaneously ground.

2. The small-diameter heat exchange tube grinding treatment device according to claim 1 is characterized in that: The outer wall grinding component comprises a spring sheet (5) having an L-shaped cross section and sandpaper (6) arranged on the side of the spring sheet; a plurality of through holes (11) are provided on the wall of the fixed sleeve (1); one end of the outer wall grinding component is fixedly connected to the outside of the fixed sleeve (1), and the other end extends from the through hole (11) into the interior of the fixed sleeve (1).

3. The small-diameter heat exchange tube grinding treatment device according to claim 1 is characterized in that: The ratio of the friction coefficient of the outer wall grinding component to the friction coefficient of the inner wall grinding roller (3) is 1.2 to 1.

5.

4. The small-diameter heat exchange tube grinding treatment device according to claim 2 is characterized in that: The lower end of the sandpaper (6) is 10 to 15 mm longer than the lower end of the spring sheet (5); the outer wall grinding assembly is detachable, and the size of the outer wall grinding assembly is compatible with the size of the heat exchange tube.

5. The small-diameter heat exchange tube grinding treatment device according to claim 1 is characterized in that: The rotating motor (4) is arranged at the right end of the inner wall grinding roller (3) and is fixedly connected to the right end of the inner part of the fixed sleeve (1). A bearing (7) is fixedly arranged at the left end of the inner wall grinding roller (3). The size of the bearing (7) is adapted to the inner wall grinding roller (3) and the heat exchange tube.

6. The small-diameter heat exchange tube grinding treatment device according to claim 2 is characterized in that: A fixing bolt (8) is provided at the left end of the inner wall grinding roller (3) to lock the bearing (7).

7. The small-diameter heat exchange tube grinding treatment device according to claim 2 is characterized in that: The sandpaper (6) is arranged between the spring sheet (5) and the fixed sleeve (1).

8. The small-diameter heat exchange tube grinding treatment device according to claim 1 is characterized in that: The rotating device is a handheld electric drill.

9. The small-diameter heat exchange tube grinding treatment device according to claim 1, characterized in that: The number of the outer wall grinding components is 3 to 6.

Images