Steel pipe lossless water pressure clamp

Abstract

The utility model provides a steel pipe lossless hydraulic pressure clamp which comprises a plug cap, a check block, a clamp body, a C-shaped sleeve, an ER chuck and an ER pressing cap, the plug cap is connected to one end of the clamp body, the check block is arranged between the plug cap and the clamp body, the ER pressing cap is connected to the other end of the clamp body, and the C-shaped sleeve is arranged between the check block and the clamp body. The ER clamping head is arranged between the ER pressing cap and the clamp body, the C-shaped sleeve is arranged in the ER clamping head, and when the ER pressing cap and the clamp body are tightened, the ER clamping head is folded in the radial direction. According to the utility model, a combined mode of clamping of the non-metal C-shaped sleeve and the ER series of chucks is adopted, the surface of the steel pipe is basically not damaged under the condition of keeping a certain clamping force, the steel pipe can be directly taken down after pressing is completed, the clamping section does not need to be cut off, and material damage is avoided. And the clamp can be repeatedly used, one set of clamp can be used for multiple times of pressing operation, and the durability is better.

Description

Technical Field

[0001] The utility model relates to the field of water pressure testing of steel pipes, in particular to a non-destructive water pressure clamp for steel pipes. Background Art

[0002] Steel pipes are usually subjected to water pressure testing before leaving the factory. The purpose is to verify the quality and performance of the steel pipes and ensure that the sealing and pressure bearing capacity of the steel pipes can meet the design requirements before being put into use.

[0003] Conventional hydraulic clamps typically use ferrules or pressure clamps. Ferrule-type clamps offer excellent sealing and are easy to install. However, their drawbacks are that they are not reusable and can cause damage to the steel pipe surface during tightening. This often requires cutting away any deformed steel pipe after the clamping process, resulting in some material loss. Pressure clamps can be reused, but they still cause some damage to the steel pipe surface during tightening, requiring further removal after the clamping process, also resulting in some material loss. Utility Model Content

[0004] The purpose of the utility model is to provide a non-destructive hydraulic clamp for steel pipes, which solves the technical problems in the background art of the existing hydraulic test clamp for steel pipes being non-reusable and causing material loss due to the removal of deformed parts after pressure testing.

[0005] To achieve the above-mentioned objectives, the utility model provides a non-destructive hydraulic clamp for steel pipes, comprising a plugging cap, a block, a clamp body, a C-sleeve, an ER chuck, and an ER pressure cap. The plugging cap is connected to one end of the clamp body, the block is arranged between the plugging cap and the clamp body, the ER pressure cap is connected to the other end of the clamp body, the ER chuck is arranged between the ER pressure cap and the clamp body, the C-sleeve is arranged in the ER chuck, and the ER chuck is radially retracted during the tightening of the ER pressure cap and the clamp body.

[0006] Furthermore, a sealing member is provided in the stopper.

[0007] Furthermore, the C-shaped sleeve is a nylon C-shaped sleeve.

[0008] Compared with existing technologies, the present invention offers the following advantages: the steel pipe clamping portion utilizes a nylon C-shaped sleeve and ER series chucks, maintaining a certain clamping force while maintaining minimal damage to the steel pipe surface. After the press is complete, the clamp can be removed directly without cutting the clamping section, thus avoiding material loss. The clamp is reusable, allowing for multiple press operations with one set, resulting in excellent durability. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0010] Figure 2 It is a cross-sectional view of the utility model;

[0011] Figure 3 This is an exploded perspective view of the present utility model;

[0012] In the figure, 1. plugging cap; 2. stopper; 3. seal; 4. fixture body; 5. C-shaped sleeve; 6. ER chuck; 7. ER pressure cap; 8. steel pipe; 9. first protrusion; 10. stepped hole; 11. first conical surface; 12. front conical surface; 13. second protrusion; 14. flat position; 15. rear end; 16. front end; 17. second conical surface; 18. rear conical surface; 19. end face. DETAILED DESCRIPTION

[0013] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in a variety of different configurations.

[0014] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0015] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0016] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship commonly placed when the utility model is used. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0017] In addition, terms such as "horizontal" and "vertical" do not mean that the components must be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", not that the structure must be completely horizontal, but can be slightly tilted.

[0018] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0019] Some embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0020] The utility model discloses a non-destructive hydraulic clamp for steel pipes, comprising a plug cap 1, a stopper 2, a clamp body 4, a C-shaped sleeve 5, an ER chuck 6, and an ER pressure cap 7. The clamp body 4 is cylindrical, having a radially slightly smaller front end 15 and a radially slightly larger rear end 16. Both the front end 15 and the rear end 16 are processed with external threads, and the rear end 16 is provided with a flat portion 14 for clamping. The external threads at the front end 15 match the booster interface of the hydraulic press and can be connected to the booster interface of the hydraulic press with a straight thread. The clamp body 4 is provided with a cavity extending from the front end 15 to the rear end 16. The cavity includes a stepped hole 10 at the front end 15 and a first tapered surface 11 at the rear end 16. The first tapered surface 11 tapers inwardly from the end of the rear end 16. The stopper 2 is L-shaped, with its transverse portion extending into the stepped hole 10 at the front end 15 of the clamp body 4, and a radial first protrusion 9 resting on the end face of the front end 15. The plugging cap 1 is provided with an internal thread that matches the front end 15 of the clamp body 4. The plugging cap 1 is threadedly connected to the front end 15 of the clamp body 4 and defines the stopper 2 therein.

[0021] The ER collet 6 is disposed at the rear end 16 of the clamp body 4. The ER collet 6 includes a front tapered surface 12 and a rear tapered surface 18. The taper of the front tapered surface 12 is substantially the same as that of the first tapered surface 11 at the rear end 16 of the clamp body 4, and the taper of the rear tapered surface 18 is substantially the same as that of the second tapered surface 17 within the ER pressure cap 7. The ER pressure cap 7 is internally threaded and is threadedly connected to the rear end 16 of the clamp body 4, thereby confining the ER collet 6 at the rear end 16 of the clamp body 4. A C-shaped sleeve 5 is disposed within the ER collet 6. The C-shaped sleeve 5 is L-shaped with a C-shaped cross-section and radially defines a second protrusion 13. The second protrusion 13 is configured to abut against the end face 19 of the ER collet 6. Before the ER pressure cap 7 is tightened to the clamp body 4, the C-shaped sleeve 5 is axially movable within the ER collet 6. During the tightening of the ER pressing cap 7 and the clamp body 4, the second tapered surface 17 of the ER pressing cap 7 squeezes the rear tapered surface 18 of the ER collet 6, forcing the front tapered surface 12 of the ER collet 6 to squeeze the first tapered surface 11 of the clamp body 4. The two ends of the ER collet 6 are forced to contract, thereby clamping the C-shaped sleeve 5.

[0022] The principle of operation of this utility model is as follows: Take two sets of clamps. Remove the plug cap 1 from one set and loosen the ER pressure cap 7. Remove the steel pipe 8 to be pressurized and insert one end of it through the C-shaped sleeve 5 until it passes through the entire clamp. Adjust the end of the steel pipe 8 to slightly protrude from the stopper 2. Ensure that the steel pipe 8 does not move, then use an ER wrench to tighten the ER pressure cap 7 onto the rear end 16 of the clamp body 4 to clamp the steel pipe 8. Then, thread the front end 15 of the clamp body 4 onto the booster port of the hydraulic press. Then, remove the plug cap 1 from the other set of clamps and loosen the ER pressure cap 7. Insert the other end of the steel pipe 8 to be pressurized through the C-shaped sleeve 5 until it passes through the entire clamp. Adjust the end of the steel pipe 8 to slightly protrude. Then, slowly screw the plug cap 1 onto the front end 15 of the other set of clamps 1 until it is tightened. Ensure that the steel pipe 8 does not move, then use an ER wrench to tighten the ER pressure cap 7 onto the rear end 16 of the clamp body 4 to clamp the steel pipe 8. Start the hydraulic press to carry out the hydraulic pressure test. After the pressure test is completed, loosen the ER pressure caps 7 at both ends of the steel pipe 8 and remove it.

[0023] In a preferred embodiment, an inner groove can be provided on the transverse portion of stopper 2, and a seal 3 can be disposed in the inner groove. Seal 3 can provide a good seal between steel pipe 8 and the clamp during pressing. C-shaped sleeve 5 is made of a non-metallic material, preferably nylon. Nylon C-shaped sleeves have excellent mechanical strength and good wear resistance, are lightweight, and will not damage the pipe wall.

[0024] The above describes the basic principles and advantages of the present invention. For those skilled in the art, the above embodiments are merely illustrative of the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, after reading this specification, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments or replace some or all of the technical features therein with equivalents. Any obvious replacements are within the scope of protection of the present invention without departing from the concept of the present invention.

Claims

1. A non-destructive hydraulic clamp for steel pipes, characterized in that: The utility model comprises a plugging cap (1), a stopper (2), a fixture body (4), a C-shaped sleeve (5), an ER chuck (6), and an ER pressure cap (7); the plugging cap (1) is connected to one end of the fixture body (4); the stopper (2) is arranged between the plugging cap (1) and the fixture body (4); the ER pressure cap (7) is connected to the other end of the fixture body (4); the ER chuck (6) is arranged between the ER pressure cap (7) and the fixture body (4); the C-shaped sleeve (5) is arranged in the ER chuck (6); and when the ER pressure cap (7) and the fixture body (4) are tightened, the ER chuck (6) is radially retracted.

2. A non-destructive hydraulic clamp for steel pipes according to claim 1, characterized in that: A sealing member (3) is provided in the stopper (2).

3. A non-destructive hydraulic clamp for steel pipes according to claim 2, characterized in that: The C-shaped sleeve (5) is a nylon C-shaped sleeve.

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