Adjustable clamping tool for surfacing of inner wall of steel pipe

Abstract

The utility model belongs to the technical field of surfacing equipment, and particularly relates to an adjustable clamping tool for surfacing of the inner wall of a steel pipe. According to the adjustable clamping tool for surfacing of the inner wall of the steel pipe, the outer pipe units and the composite block units are arranged, so that firstly, the outer pipe units are connected outside a mother pipe in a sleeving mode, the temperature of the mother pipe during surfacing is stable and balanced, the cooling difference of the mother pipe is small, the welding quality is guaranteed, and the welding efficiency is improved; meanwhile, the influence of the outside on the mother pipe can be reduced; the main pipe is clamped through the composite block units on the outer pipe units, the rotary chuck drives the outer pipe units to rotate, and therefore the main pipe is driven to rotate, multi-output driving is achieved, it is guaranteed that the rotation rates of all the sections of the main pipe are the same, and the overall assembly is convenient and can be repeatedly used after being disassembled.

Description

Technical Field

[0001] This utility model belongs to the technical field of surfacing equipment, and in particular relates to an adjustable clamping fixture for surfacing the inner wall of steel pipes. Background Technology

[0002] Bimetallic composite pipes are composed of two different metal pipes: carbon steel or other alloy steel as the outer base material and a thin-walled corrosion-resistant alloy material as the inner lining for corrosion protection or other functional purposes. They possess both excellent mechanical properties and strong performance in use, and the appropriate base material and lining can be selected and matched according to different service environments. Bimetallic composite pipes are manufactured using various processes, one of the more common being the surfacing welding of the inner wall of the base pipe.

[0003] Hardfacing is a surface finishing process that uses a heat source to melt and bond a base material and a welding material. By melting and depositing metal materials onto the surface of a workpiece, it can alter the workpiece's dimensions, restore its original shape, or change the surface properties of the workpiece. Hardfacing technology can strengthen the surface of mechanical parts, improve their performance, and extend their service life, thus possessing significant economic value. Current pipe inner wall hardfacing typically uses a rotating fixture. The main pipe is held by a rotating chuck and supported by two sets of rollers. After the welding torch is inserted into the pipe, the chuck rotates while the welding torch performs hardfacing on the inner wall of the pipe.

[0004] Chinese utility model patent with patent publication number CN204954137U and publication date of January 13, 2016, discloses a tooling for preventing the steel pipe from shifting during internal wall welding. The structure includes a base, on which a drive wheel frame and a driven wheel frame are arranged on the same axis. A drive wheel is installed on the drive wheel frame, and the drive wheel is provided with a circumferential V-groove. A positioning ring for locking the steel pipe is connected to the two drive wheels. A V-shaped boss adapted to the V-groove is provided on the outer wall of the positioning ring. Two driven wheels for supporting the steel pipe are installed on the driven wheel frame.

[0005] The steel pipe inner wall overlay welding anti-movement tool in this utility model patent has the following general structural principle: one end of the steel pipe is connected by a positioning ring, and tightening the bolts can lock the steel pipe. The other end of the steel pipe is supported by a driven wheel. The V-groove of the driving wheel and the V-shaped boss of the positioning ring are installed together. The driving wheel drives the positioning ring to rotate the steel pipe, completing the overlay welding work on the inner wall of the steel pipe. The V-groove and the V-shaped boss can play a positioning role to prevent the steel pipe from moving back and forth and affecting the weld quality.

[0006] However, the anti-movement tooling with weld overlay on the inner wall of the steel pipe still has at least two shortcomings in actual use, which are the technical problems that this utility model aims to solve.

[0007] 1. The tooling lacks insulation, which causes the exposed steel pipe to cool down quickly during welding, thus affecting the welding effect.

[0008] 2. Its tooling relies solely on the drive wheel to rotate the positioning ring that clamps the steel pipe, making it difficult to achieve the effect of multi-point drive. The rotation speed decreases the further away from the drive wheel.

[0009] Therefore, in summary, there is an urgent need for a new type of anti-deformation tooling for steel pipe inner wall overlay welding that has heat preservation function and multiple driving points. Utility Model Content

[0010] This utility model provides an adjustable clamping fixture for surfacing the inner wall of steel pipes. By setting up outer pipe units and composite block units, it can achieve the following: 1. Several outer pipe units are sleeved on the outside of the main pipe, making the temperature of the main pipe more stable and uniform during surfacing, with a small cooling difference, ensuring welding quality, and reducing the influence of external factors on the main pipe; 2. The main pipe is clamped by the composite block units on the outer pipe units. The rotating chuck drives the outer pipe units to rotate, thereby driving the main pipe to rotate. It has multiple drives to ensure that the rotation speed of each section of the main pipe is the same, and the whole assembly is convenient and can be disassembled and reused.

[0011] The technical solution adopted by this utility model to solve the above problems is: an adjustable clamping fixture for overlay welding of the inner wall of steel pipe, the structure of which includes a plurality of outer pipe units sleeved on the mother pipe and used for heat preservation and driving operation of the mother pipe, and a composite block unit screwed on the outer pipe units and used for radially clamping the mother pipe.

[0012] A further preferred technical solution is that the outer tube unit includes an auxiliary outer tube and a positioning hole is provided on the auxiliary outer tube.

[0013] A further preferred technical solution is that the composite block unit includes a screw disposed on the positioning hole and a clamping block disposed on the screw and used to clamp the mother tube.

[0014] A further preferred technical solution is that the outer tube unit also includes heat dissipation holes disposed on the auxiliary outer tube.

[0015] A further preferred technical solution is that the composite block unit further includes a protruding ring disposed on the screw, and a locking groove disposed on the clamping block for engaging the protruding ring.

[0016] A further preferred technical solution is that the composite block unit further includes an arc-shaped plate disposed on the clamping block and used to fit the mother tube.

[0017] A further preferred technical solution is that the composite block unit also includes a locking nut disposed on the screw.

[0018] A further preferred technical solution is that the composite block unit further includes a heat-resistant sheet disposed on the outer surface of the clamping block.

[0019] A further preferred technical solution includes a fixing block disposed on the outer annular surface of the mother tube and used to block and engage the clamping block in the length direction of the mother tube.

[0020] A further preferred technical solution includes a length-direction connecting piece sleeved on at least two of the screws and used to connect two adjacent auxiliary outer tubes. Attached Figure Description

[0021] Figure 1 This is a structural diagram of the present invention.

[0022] Figure 2 This is a side view of the outer tube unit in this utility model.

[0023] Figure 3 This is a side view of the present invention.

[0024] Figure 4 This is a schematic diagram showing the connection between the outer tube unit and the composite block unit in this utility model.

[0025] Figure 5 This is a schematic diagram of the composite block unit structure in this utility model.

[0026] Figure 6 This is a partially enlarged view of the present invention.

[0027] The meanings of the markings in the diagram are as follows:

[0028] a) Main pipe, b) Weld seam, c) Welding torch, d) Welding torch travel bracket, e) Rotary chuck;

[0029] Base 11, roller support 12;

[0030] Outer tube unit 1, composite block unit 2, fixing block 3, length-direction connecting piece 4;

[0031] Auxiliary outer tube 101, positioning hole 102, heat dissipation hole 103, screw 201, clamping block 202, protruding ring 203, locking groove 204, arc plate 205, locking nut 206, heat-resistant sheet 207. Detailed Implementation

[0032] The following description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

[0033] As attached Figure 1-6As shown, an adjustable clamping fixture for overlay welding of the inner wall of a steel pipe includes a plurality of outer pipe units 1 sleeved on a main pipe a and used for heat preservation and driving operation of the main pipe a, and a composite block unit 2 screwed on the outer pipe units 1 and used for radially clamping the main pipe a.

[0034] In this embodiment, the outer tube unit 1 is sleeved on the mother tube a. The rotating chuck e clamps the outer tube unit 1 at the end of the mother tube a. The rotating chuck e can drive the outer tube unit 1 at the end of the mother tube a to rotate, thereby driving the entire mother tube a to rotate. The roller support 12 is provided under the outer tube unit 1 in the middle of the mother tube a. The roller support 12 is set on the base 11 to support the outer tube unit 1, while not restricting the rotational freedom of the outer tube unit 1. A driving device can be set on the roller base 12 to drive the rotation of the middle outer tube unit 1, ensuring that the rotational speed of the mother tube a in all parts is consistent. Moreover, the outer tube unit 1 and the roller support 12 can be set according to the length of the mother tube a, which is convenient to assemble and highly flexible. The rotational speed and stability of the mother tube a are less affected by the length.

[0035] Furthermore, the composite block unit 2 is disposed on the outer tube unit 1 and screwed to the outer tube unit 1, thereby adjustingly clamping the mother tube a. After the composite block unit 2 clamps the mother tube a, the outer tube unit 1 can drive the mother tube a to rotate stably. At least three composite block units 2 with the same cross section are provided to ensure the clamping effect on the mother tube a and reduce the possibility of slippage and shaking.

[0036] Finally, in use, one end of the outer tube unit 1 is clamped by the rotating chuck e. The length of the mother tube a can be measured in advance to select the number of outer tube units 1. The outer tube unit 1 is then fitted onto the mother tube a, with the middle portion of the outer tube unit 1 resting on the roller support 12 on the base 11. The welding torch traveling bracket d is located at the other end of the mother tube a. The welding torch c is mounted on the welding torch traveling bracket d and can move left and right relative to the mother tube a to perform welding on the inner wall of the mother tube a. Welding particles or welding materials can be sprayed into the mother tube a in advance. When the welding torch c performs welding on the mother tube a, the weld seam b is formed. Under the rotational drive of the rotating chuck e or other driving device, the mother tube a rotates, allowing the welding torch c to perform circumferential welding on the inner wall of the mother tube a. The welding torch c can also move inward to perform all-round welding on the inner wall of the mother tube a.

[0037] The outer tube unit 1 includes an auxiliary outer tube 101 and a positioning hole 102 provided on the auxiliary outer tube 101.

[0038] In this embodiment, the auxiliary outer tube 101 is used to sleeve the mother tube a, and its diameter is larger than that of the mother tube a. It can also be used to install the composite block unit 2. The positioning hole 102 is a threaded hole, and at least three positioning holes 102 are provided on the same interface. At least two sets of positioning holes 102 are provided at both ends of the auxiliary outer tube 101, thereby ensuring the clamping effect of the composite block unit 2 on the mother tube a.

[0039] The composite block unit 2 includes a screw 201 disposed on the positioning hole 102 and a clamping block 202 disposed on the screw 201 and used to clamp the mother tube a.

[0040] In this embodiment, the screw 201 is screwed to the positioning hole 102. By turning the knob, the clamping block 202 at the other end of the screw 201 moves closer to the mother tube a and clamps the mother tube a. After the auxiliary outer tube 101 is sleeved on the mother tube a, turning the screw 201 causes the composite block unit 2 to clamp the mother tube a.

[0041] The outer tube unit 1 also includes heat dissipation holes 103 disposed on the auxiliary outer tube 101.

[0042] In this embodiment, the heat dissipation hole 103 is misaligned with the positioning hole 102. The function of the heat dissipation hole 103 is to prevent the temperature inside the outer tube unit 1 from being too high, which would cause the weld seam b inside the mother tube a to accumulate, so that the internal temperature of the outer tube unit 1 is within a reasonable temperature range and does not affect the cooling requirements of the mother tube a.

[0043] The composite block unit 2 also includes a protruding ring 203 disposed on the screw 201, and a locking groove 204 disposed on the clamping block 202 for engaging the protruding ring 203.

[0044] In this embodiment, the protruding ring 203 is disposed at one end of the screw 201 near the clamping block 202. The clamping block 202 is provided with a locking groove 204 that engages with the protruding ring 203, so that the clamping block 202 does not affect the rotational freedom of the screw 201 while moving up and down with the screw 201, thus ensuring the fit between the clamping block 202 and the mother tube.

[0045] The composite block unit 2 also includes an arc-shaped plate 205 disposed on the clamping block 202 and used to fit the mother tube a.

[0046] In this embodiment, the arc-shaped plate 205 is used to increase the friction between the clamping block 202 and the mother tube a. The curvature of the arc-shaped plate 205 can be consistent with the outer wall of the mother tube a, so that it can perfectly fit the mother tube a. The arc-shaped plate 205 can also fit the mother tube a as a whole, but it is provided with an inward groove, thereby increasing the friction with the mother tube a.

[0047] The composite block unit 2 also includes a locking nut 206 disposed on the screw 201.

[0048] In this embodiment, the locking nut 206 serves to further strengthen the clamping force and stability of the clamping block 202 after the screw 201 is tightened and the clamping block 202 clamps the mother tube a, thereby limiting the screw 201. When the auxiliary outer tube 101 is not in use, the locking nut 206 can also further prevent the composite block unit 2 from falling off.

[0049] The composite block unit 2 also includes a heat-resistant sheet 207 disposed on the outer surface of the clamping block 202.

[0050] In this embodiment, the function of the heat-resistant sheet 207 is to protect the clamping block 202, prevent the clamping block 202 from deforming or being damaged due to high temperature, and extend the service life of the workpiece.

[0051] It also includes a fixing block 3 disposed on the outer ring surface of the mother tube a and used to block and engage the clamping block 202 in the length direction of the mother tube a.

[0052] In this embodiment, the fixing block 3 is disposed at both ends of the main tube a and is connected to the clamping block 202 at the same position to strengthen the connection between the main tube a and the clamping block 202. The fixing block 3 can be connected to the clamping block 202 by screws, or the fixing block 3 can be connected to the main tube a by welding or adhesive bonding.

[0053] It also includes a length-direction connecting piece 4 that is sleeved on at least two of the screws 201 and used to connect two adjacent auxiliary outer tubes 101.

[0054] In this embodiment, the length-direction connecting piece 4 is used to fix adjacent auxiliary outer tubes 101, increasing the integrity and connection stability between the auxiliary outer tubes 101. The length-direction connecting piece 4 can be directly connected to the auxiliary outer tube 101, or adjacent auxiliary outer tubes 101 can be connected by sleeve of the screw 201.

[0055] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings. However, this utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various modifications can be made without departing from the spirit of this utility model. These are non-inventive modifications and are protected by patent law as long as they fall within the scope of the claims of this utility model.

Claims

1. An adjustable clamping fixture for overlay welding on the inner wall of a steel pipe, characterized in that: The structure includes several outer tube units (1) sleeved on the mother tube (a) and used for heat preservation and driving operation of the mother tube (a), and a composite block unit (2) screwed on the outer tube units (1) and used for radially clamping the mother tube (a).

2. The adjustable clamping fixture for overlay welding on the inner wall of a steel pipe according to claim 1, characterized in that: The outer tube unit (1) includes an auxiliary outer tube (101) and a positioning hole (102) provided on the auxiliary outer tube (101).

3. The adjustable clamping fixture for overlay welding on the inner wall of a steel pipe according to claim 2, characterized in that: The composite block unit (2) includes a screw (201) disposed on the positioning hole (102) and a clamping block (202) disposed on the screw (201) and used to clamp the mother tube (a).

4. The adjustable clamping fixture for overlay welding of the inner wall of a steel pipe according to claim 2, characterized in that: The outer tube unit (1) also includes heat dissipation holes (103) provided on the auxiliary outer tube (101).

5. The adjustable clamping fixture for overlay welding on the inner wall of a steel pipe according to claim 3, characterized in that: The composite block unit (2) further includes a protruding ring (203) disposed on the screw (201) and a locking groove (204) disposed on the clamping block (202) for engaging the protruding ring (203).

6. The adjustable clamping fixture for overlay welding of the inner wall of a steel pipe according to claim 3, characterized in that: The composite block unit (2) also includes an arc plate (205) disposed on the clamping block (202) and used to fit the mother tube (a).

7. The adjustable clamping fixture for overlay welding of the inner wall of a steel pipe according to claim 3, characterized in that: The composite block unit (2) also includes a locking nut (206) disposed on the screw (201).

8. The adjustable clamping fixture for overlay welding of the inner wall of a steel pipe according to claim 3, characterized in that: The composite block unit (2) also includes a heat-resistant sheet (207) disposed on the outer surface of the clamping block (202).

9. The adjustable clamping fixture for overlay welding on the inner wall of a steel pipe according to claim 3, characterized in that: It also includes a fixing block (3) disposed on the outer ring surface of the mother tube (a) and used to block and engage the clamping block (202) in the length direction of the mother tube (a).

10. The adjustable clamping fixture for overlay welding of the inner wall of a steel pipe according to claim 3, characterized in that: It also includes a length-direction connecting piece (4) that is sleeved on at least two of the screws (201) and used to connect two adjacent auxiliary outer tubes (101).

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