Hydraulic clamp and application thereof

Abstract

The invention relates to a water pressure clamp and application thereof. The water pressure clamp comprises a clamp body, a water inlet formed in the side face of the clamp body and a water inlet channel formed in the clamp body. An oval through hole is formed in the surface of the clamp body. The water inlet is arranged corresponding to the long axis of the elliptical through hole; the problem that a traditional water pressure clamp with a circular through hole and a water inlet formed in the surface of a clamp body is not matched with an oval water inlet tool is solved, the water pressure clamp has excellent sealing performance, clamping degree and stability under the water pressure effect, and the water pressure test of the oval water inlet tool can be efficiently completed; and a highly-adaptive hydraulic pressure clamp is provided for the same type of tools.

Description

Technical Field

[0001] The invention relates to the technical field of water pressure test fixtures, in particular to a water pressure fixture and application thereof. Background Art

[0002] The circular plate-shaped target with built-in water channel needs to withstand a certain amount of water pressure during use. It has high requirements for its sealing performance, pipeline welding quality and other performance. Therefore, a water pressure test is required after production to ensure that the product is qualified. The water pressure test refers to a test method that injects liquid (usually water) into the object being tested by applying a specific pressure to evaluate its sealing performance and pressure bearing capacity. The water pressure test can determine whether the pipeline has leaks and whether it can withstand the pressure required by the design.

[0003] The requirements for the hydraulic clamp during the hydraulic test are also high. Usually, the clamp must have good sealing to ensure that there is no leakage during the hydraulic test; the clamp needs to have sufficient strength and stability to maintain deformation under the test pressure to ensure that the target remains fixed during the test; the clamp should be able to adapt to the size and shape of the target to ensure a firm clamp; the clamp design should be easy to install and disassemble, while not affecting the observation and detection of the target during the test. For circular plate targets, the internal water channel structure is complex, which may lead to local stress concentration, increase the difficulty of the test, and place higher requirements on the clamp.

[0004] CN108692885A discloses a leak detection fixture and a leak detection system for detecting whether a circular target has cracks. The leak detection fixture comprises: a fixture body and a fixture interface opened on the fixture body; when the fixture body is fixedly connected to the circular target, the fixture interface corresponds to the water inlet of the circular target; however, the leak detection fixture and the leak detection system are still aimed at targets with circular water inlets, and cannot be adapted to targets with elliptical water inlets for water pressure testing.

[0005] Therefore, how to develop a hydraulic fixture suitable for elliptical water inlet tooling and its use to efficiently complete the hydraulic test of the corresponding products is a technical problem that needs to be urgently solved in this field. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides a hydraulic clamp and its use, which is suitable for elliptical water inlet tooling and has good sealing properties. It can ensure that the tooling remains fixed during the hydraulic pressure test and complete the hydraulic pressure test of the tooling with quality and quantity. It is also more convenient to install and disassemble, saving time and manpower.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In a first aspect, the present invention provides a hydraulic fixture, which includes a fixture body, a water inlet provided on the side surface of the fixture body, and a water inlet channel provided inside the fixture body;

[0009] An oval through-hole is provided on the surface of the fixture body; the water inlet is correspondingly arranged with the major axis of the oval through-hole.

[0010] By designing that the surface of the fixture body is provided with an oval through-hole, which is adapted to the oval water inlet tooling, and at the same time the water inlet is arranged on the side surface of the fixture body, the present invention avoids the problem that the traditional fixture and the C-clamp for fixing the fixture affect each other when injecting water through the water inlet on the surface of the main body, and improves the sealing performance of the hydraulic fixture and the test efficiency of the hydraulic test.

[0011] Preferably, the ratio of the length of the major axis to the minor axis of the oval through-hole is (2.2 - 2.6):1, for example, it can be 2.2:1, 2.3:1, 2.4:1, 2.5:1 or 2.6:1, etc.

[0012] Preferably, the oval through-hole is arranged at the central position on the surface of the fixture body.

[0013] Preferably, the water inlet channel includes a first water inlet channel and a second water inlet channel, and the first water inlet channel communicates with the second water inlet channel.

[0014] Preferably, the central lines of the first water inlet channel, the water inlet and the major axis of the oval through-hole coincide.

[0015] Preferably, the central line of the second water inlet channel coincides with the minor axis of the oval through-hole.

[0016] Preferably, a boss is provided on the side of the second water inlet channel away from the first water inlet channel.

[0017] The present invention further preferably provides that a boss is provided on the side of the second water inlet channel away from the first water inlet channel, which is used for quick and accurate positioning when assembling the hydraulic fixture and the tooling, increases the contact area and friction force between the hydraulic fixture and the tooling, and ensures that the tooling remains stable and does not displace during the hydraulic test; and the design of the boss also makes the loading and unloading of the hydraulic fixture more convenient and fast, improving the test efficiency.

[0018] Preferably, the boss coincides with the central line of the second water inlet channel.

[0019] Preferably, the ratio of the depth of the boss to the diameter of the second water inlet channel is (0.2 - 0.5):1, for example, it can be 0.2:1, 0.25:1, 0.3:1, 0.35:1, 0.4:1, 0.45:1 or 0.5:1, etc.

[0020] The present invention further preferably has the ratio of the depth of the boss to the diameter of the second water inlet channel as (0.2 - 0.5):1, which is beneficial to giving full play to the positioning function, and can play a clamping role, ensuring that the interface between the water pressure fixture and the tooling does not fall off under the action of water pressure, so as to efficiently complete the water pressure test; if the ratio of the depth of the boss to the diameter of the second water inlet channel is too small, that is, the depth of the boss is small, resulting in poor clamping force, and it is extremely easy to generate displacement under the action of water pressure, resulting in the interface falling off and the water pressure test cannot be normally completed; if the ratio of the depth of the boss to the diameter of the second water inlet channel is too large, that is, the depth of the boss is large, it will lead to difficult assembly, and even cause extrusion to the tooling, resulting in the pipeline of the tooling being broken and the quality deteriorating.

[0021] Preferably, the ratio of the width of the boss to the diameter of the second water inlet channel is (1.3 - 1.6):1, for example, it can be 1.3:1, 1.35:1, 1.4:1, 1.45:1, 1.5:1, 1.55:1 or 1.6:1, etc.

[0022] The present invention further preferably has the ratio of the width of the boss to the diameter of the second water inlet channel as (1.3 - 1.6):1, which is beneficial to accurately positioning the interface, improving the assembly efficiency, and ensuring the assembly stability: if the ratio of the width of the boss to the diameter of the second water inlet channel is too low, that is, the width of the boss is narrow, resulting in insufficient clamping force, and the interface between the water pressure fixture and the tooling will fall off under the action of water pressure, and the water pressure test cannot be normally completed; if the ratio of the width of the boss to the diameter of the second water inlet channel is too high, that is, the width of the boss is wide, it will lead to an increase in the assembly difficulty and is likely to cause mechanical damage to the tooling.

[0023] Preferably, a sealing member is provided on the periphery of the elliptical through hole.

[0024] Preferably, the sealing member includes an annular rubber ring.

[0025] The present invention further preferably has a sealing member provided on the periphery of the elliptical through hole, which significantly improves the sealing effect of the water pressure fixture, so that no leakage and other problems will occur to the tooling during the water pressure test.

[0026] It should be noted that the perimeter of the annular rubber ring of the present invention is the same as the perimeter of the elliptical through hole on the surface of the fixture body to ensure high tightness.

[0027] In a second aspect, the present invention provides a use of the water pressure fixture described in the first aspect, and the water pressure fixture is used for clamping an elliptical water inlet tooling for a water pressure test.

[0028] The hydraulic pressure clamp described in the first aspect of the present invention is specially designed for the oval water inlet tooling, highly adaptable to the oval water inlet tooling, capable of stably clamping the oval water inlet, ensuring tightness, and being able to complete the hydraulic pressure test of the oval water inlet tooling with high quality.

[0029] Preferably, the oval water inlet of the oval water inlet tooling has the same size as the oval through hole of the hydraulic pressure clamp.

[0030] Preferably, the oval water inlet tooling includes an oval water inlet target with a pipeline built therein.

[0031] Preferably, the water inlet of the pipeline has the same diameter as the second water inlet channel of the hydraulic pressure clamp.

[0032] In the present invention, a water pipe is used to connect the hydraulic pressure clamp and the target, and preferably a quick pneumatic joint is used at the joint to facilitate quick replacement and removal of the water pipe.

[0033] The usage method of the hydraulic pressure clamp of the present invention, taking the example of clamping the oval water inlet tooling for a hydraulic pressure test, includes the following steps:

[0034] (1) Place the hydraulic pressure clamp at the water inlet of the oval water inlet tooling and fix it with a C-clamp.

[0035] (2) Then connect the water pipe of the hydraulic pressure equipment to the water inlet of the hydraulic pressure clamp through a quick joint.

[0036] (3) Conduct a hydraulic pressure test by passing water through the hydraulic pressure equipment, and check whether there is water leakage at the sealing part and the welding part.

[0037] Compared with the prior art, the present invention has at least the following beneficial effects:

[0038] (1) The hydraulic pressure clamp provided by the present invention, by opening an oval through hole on the surface of the clamp body, designing the water inlet on the side of the clamp body, setting a boss and further selecting the ratio of the depth and width of the boss to the diameter of the second water inlet channel, and setting sealing components and other structural optimizations, the various structures cooperate to make the hydraulic pressure clamp have stronger tightness, be more adaptable to the oval water inlet tooling, and ensure stable clamping during the hydraulic pressure test, providing a hydraulic pressure clamp with a structurally fitting for the oval water inlet tooling, which is beneficial to completing the hydraulic pressure test with high quality.

[0039] (2) The use of the hydraulic pressure clamp provided by the present invention. The hydraulic pressure clamp is used to clamp the tooling of the elliptical water inlet for a hydraulic pressure test. It is customized for the elliptical water inlet. During the high-pressure test, the hydraulic pressure clamp has high clamping stability, preventing the tooling from deforming or shifting due to the action of the hydraulic pressure, ensuring the reliability of the test. In addition, the hydraulic pressure clamp has strong sealing performance, ensuring that water does not leak, and at the same time avoiding interference from the outside to the test results. Moreover, the water clamp is convenient to load and unload, improving the test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a top view structural schematic diagram of the hydraulic pressure clamp provided in Embodiment 1 of the present invention;

[0041] Figure 2 is a schematic diagram of the setting position of the water inlet channel and its boss of the hydraulic pressure clamp provided in Embodiment 1 of the present invention;

[0042] Figure 3 is an assembly schematic diagram of the hydraulic pressure clamp provided in Embodiment 1 of the present invention and the elliptical water inlet target material with a pipeline built-in;

[0043] In the figure: 1. Hydraulic pressure clamp; 11. Clamp body; 12. Water inlet; 13. Water inlet channel; 131. First water inlet channel; 132. Second water inlet channel; 14. Elliptical through hole; 15. Annular rubber ring; 16. Boss; 2. Elliptical water inlet target material with a pipeline built-in. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The technical solution of the present invention will be further described below in conjunction with the drawings and through specific embodiments. However, the following examples are only simple examples of the present invention and do not represent or limit the scope of the protection of the present invention. The scope of protection of the present invention shall be subject to the claims.

[0045] The test conditions for the hydraulic pressure test in the following examples and comparative examples: The test pressure is 0.5 MPa and the test time is 1 h.

[0046] I. Embodiment

[0047] Embodiment 1

[0048] This embodiment provides a hydraulic pressure clamp 1, as Figures 1 to 3 shown. The hydraulic pressure clamp 1 includes a clamp body 11, a water inlet 12 provided on the side of the clamp body 11, and a water inlet channel 13 provided inside the clamp body 11;

[0049] An oval through-hole 14 is formed on the surface of the fixture body 11; the water inlet 12 is arranged corresponding to the major axis of the oval through-hole 14; the ratio of the length of the major axis to the minor axis of the oval through-hole 14 is 2.4:1; the oval through-hole 14 is arranged at the center of the surface of the fixture body 11; a ring-shaped rubber ring 15 is arranged on the periphery of the oval through-hole 14;

[0050] The water inlet channel 13 includes a first water inlet channel 131 and a second water inlet channel 132, and the first water inlet channel 131 communicates with the second water inlet channel 132; the center lines of the first water inlet channel 131, the water inlet 12 and the major axis of the oval through-hole 14 coincide; the center line of the second water inlet channel 132 coincides with the minor axis of the oval through-hole 14;

[0051] A boss 16 is arranged on one side of the second water inlet channel 132 away from the first water inlet channel 131; the boss 16 coincides with the center line of the second water inlet channel 132; the ratio of the depth of the boss 16 to the diameter of the second water inlet channel 132 is 0.3:1; the ratio of the width of the boss 16 to the diameter of the second water inlet channel 132 is 1.5:1.

[0052] This embodiment also provides a use of the hydraulic pressure fixture 1. The hydraulic pressure fixture 1 is used to clamp the oval water inlet target 2 with a pipeline inside for a hydraulic pressure test; the oval water inlet 12 of the oval water inlet target 2 with a pipeline inside has the same size as the oval through-hole 14 of the hydraulic pressure fixture 1; the water inlet 12 of the pipeline has the same diameter as the second water inlet channel 132 of the hydraulic pressure fixture 1.

[0053] The clamping force of the hydraulic pressure fixture 1 on the oval water inlet target 2 with a pipeline inside in this embodiment is strong, which ensures that the target will not be worn while ensuring stability, and guarantees the quality of the target; during the hydraulic pressure test, the sealing performance of the hydraulic pressure fixture 1 can be guaranteed, and under the action of the hydraulic pressure, the interface between the hydraulic pressure fixture 1 and the oval water inlet target 2 with a pipeline inside will still not displace, and the hydraulic pressure fixture 1 is convenient to load and unload, and the efficiency of the hydraulic pressure test is high.

[0054] Embodiment 2

[0055] This embodiment provides a hydraulic pressure fixture, which includes a fixture body, a water inlet arranged on the side surface of the fixture body, and a water inlet channel arranged inside the fixture body;

[0056] An oval through-hole is formed on the surface of the fixture body; the water inlet is arranged corresponding to the major axis of the oval through-hole; the ratio of the length of the major axis to the minor axis of the oval through-hole is 2.2:1; the oval through-hole is arranged at the center position of the surface of the fixture body; a ring-shaped rubber gasket is arranged on the periphery of the oval through-hole;

[0057] The water inlet channel includes a first water inlet channel and a second water inlet channel, and the first water inlet channel communicates with the second water inlet channel; the central lines of the first water inlet channel, the water inlet and the major axis of the oval through-hole coincide; the central line of the second water inlet channel coincides with the minor axis of the oval through-hole;

[0058] A boss is arranged on one side of the second water inlet channel away from the first water inlet channel; the boss coincides with the central line of the second water inlet channel; the ratio of the depth of the boss to the diameter of the second water inlet channel is 0.2:1; the ratio of the width of the boss to the diameter of the second water inlet channel is 1.6:1.

[0059] This embodiment also provides a use of the hydraulic pressure fixture, using the above-mentioned hydraulic pressure fixture to clamp an oval water inlet target with a pipeline inside for a hydraulic pressure test; the oval water inlet of the oval water inlet target with a pipeline inside has the same size as the oval through-hole of the hydraulic pressure fixture; the water inlet of the pipeline has the same diameter as the second water inlet channel of the hydraulic pressure fixture.

[0060] The effect of the hydraulic pressure fixture described in this embodiment when clamping an oval water inlet target with a pipeline inside for a hydraulic pressure test is equivalent to that of Embodiment 1.

[0061] Embodiment 3

[0062] This embodiment provides a hydraulic pressure fixture, which includes a fixture body, a water inlet arranged on the side surface of the fixture body, and a water inlet channel arranged inside the fixture body;

[0063] An oval through-hole is formed on the surface of the fixture body; the water inlet is arranged corresponding to the major axis of the oval through-hole; the ratio of the length of the major axis to the minor axis of the oval through-hole is 2.6:1; the oval through-hole is arranged at the center position of the surface of the fixture body; a ring-shaped rubber gasket is arranged on the periphery of the oval through-hole;

[0064] The water inlet channel includes a first water inlet channel and a second water inlet channel, and the first water inlet channel communicates with the second water inlet channel; the central lines of the first water inlet channel, the water inlet and the major axis of the oval through-hole coincide; the central line of the second water inlet channel coincides with the minor axis of the oval through-hole;

[0065] A boss is provided on one side of the second water inlet channel away from the first water inlet channel; the boss coincides with the center line of the second water inlet channel; the ratio of the depth of the boss to the diameter of the second water inlet channel is 0.5:1; the ratio of the width of the boss to the diameter of the second water inlet channel is 1.2:1.

[0066] This embodiment also provides a use of the hydraulic clamp. The hydraulic clamp is used to hold an oval inlet target with a pipeline inside for a hydraulic test; the oval inlet of the oval inlet target with a pipeline inside has the same size as the oval through hole of the hydraulic clamp; the diameter of the water inlet of the pipeline is the same as that of the second water inlet channel of the hydraulic clamp.

[0067] When the hydraulic clamp described in this embodiment is used to hold an oval inlet target with a pipeline inside for a hydraulic test, the effect is equivalent to that of Embodiment 1.

[0068] Embodiment 4

[0069] This embodiment provides a hydraulic clamp, which is the same as Embodiment 1 except that the ratio of the depth of the boss to the diameter of the second water inlet channel is 0.1:1.

[0070] When the hydraulic clamp described in this embodiment is used to hold an oval inlet target with a pipeline inside for a hydraulic test, due to the relatively low depth of the boss of the hydraulic clamp, the clamping of the pipeline in the oval inlet target with a pipeline inside is unstable and displacement is likely to occur, which is equivalent to the effect without a boss, resulting in poor stability during hydraulic testing and inaccurate test results.

[0071] Embodiment 5

[0072] This embodiment provides a hydraulic clamp, which is the same as Embodiment 1 except that the ratio of the depth of the boss to the diameter of the second water inlet channel is 0.6:1.

[0073] When the hydraulic clamp described in this embodiment is used to hold an oval inlet target with a pipeline inside for a hydraulic test, due to the relatively high depth of the boss of the hydraulic clamp, when clamping the pipeline in the oval inlet target with a pipeline inside, there is more contact with the inner surface of the target, and even extrusion occurs, affecting the quality of the target.

[0074] Embodiment 6

[0075] This embodiment provides a hydraulic clamp, which is the same as Embodiment 1 except that the ratio of the width of the boss to the diameter of the second water inlet channel is 1.2:1.

[0076] When the hydraulic pressure clamp described in this embodiment is used to clamp the elliptical inlet target with a pipeline inside for a hydraulic pressure test, since the width of the convex platform of the hydraulic pressure clamp is relatively narrow, the positioning function becomes poor, and it is likely to fall off due to the action of hydraulic pressure during the hydraulic pressure test, resulting in the inability to complete the hydraulic pressure test and possibly causing damage to the target.

[0077] Example 7

[0078] This embodiment provides a hydraulic pressure clamp, which is the same as that in Example 1 except that the ratio of the width of the convex platform to the diameter of the second water inlet channel is 1.8:1.

[0079] When the hydraulic pressure clamp described in this embodiment is used to clamp the elliptical inlet target with a pipeline inside for a hydraulic pressure test, since the width of the convex platform of the hydraulic pressure clamp is relatively wide, it is difficult to assemble the hydraulic pressure clamp with the elliptical inlet target of the built-in pipeline, and it is difficult to adapt to the pipeline opening, and even causes extrusion to the target, resulting in pipeline rupture and damage to the inner surface of the target.

[0080] Example 8

[0081] This embodiment provides a hydraulic pressure clamp, which is the same as that in Example 1 except that the convex platform is not provided.

[0082] When the hydraulic pressure clamp described in this embodiment is used to clamp the elliptical inlet target with a pipeline inside for a hydraulic pressure test, since the convex platform is not provided, it is difficult to accurately position the hydraulic pressure clamp and the elliptical inlet tooling during assembly, resulting in poor airtightness and inability to meet the airtightness requirements of the hydraulic pressure test; in addition, the stability after assembly cannot be guaranteed, resulting in displacement of the hydraulic pressure clamp or the elliptical inlet tooling during the hydraulic pressure test, and the clamping performance of the hydraulic pressure clamp also becomes poor, and the hydraulic pressure test cannot be efficiently completed.

[0083] II. Comparative Examples

[0084] Comparative Example 1

[0085] This comparative example provides a hydraulic pressure clamp, which is the same as that in Example 1 except that the water inlet is arranged on the surface of the clamp body instead of the side surface of the clamp body.

[0086] When the hydraulic pressure clamp described in this comparative example is used to clamp the elliptical inlet target with a pipeline inside for a hydraulic pressure test, since the water inlet is arranged on the surface of the clamp body, it affects the C-shaped clamp that fixes the hydraulic pressure clamp during water injection. On the one hand, it causes the hydraulic pressure clamp to be unstable and the clamping of the elliptical inlet tooling to be unstable. On the other hand, it cannot ensure the airtightness of the hydraulic pressure clamp, resulting in inaccurate results of the hydraulic pressure test.

[0087] Comparative Example 2

[0088] This comparative example provides a hydraulic pressure clamp. Except that a circular through-hole is provided on the surface of the clamp body instead of an oval through-hole, the rest are the same as those in Embodiment 1.

[0089] When the hydraulic pressure clamp in this comparative example is used to clamp an oval water inlet target with a pipeline inside for a hydraulic pressure test, since a circular through-hole is provided on the surface of the clamp body instead of an oval through-hole, it is not suitable for the oval water inlet tooling and cannot stably clamp the oval water inlet tooling for the hydraulic pressure test.

[0090] In summary, by customizing the structure of the hydraulic pressure clamp, including providing an oval through-hole on the surface of the clamp body, arranging the water inlet on the side surface of the clamp body, and further providing a boss, and further preferably the width and depth of the boss, etc., the present invention improves the clamping force, stability and sealing performance of the hydraulic pressure clamp under hydraulic pressure, ensures the efficient completion of the hydraulic pressure test for the oval water inlet target with a pipeline inside, solves the problem of the inadaptability of the traditional clamp to the oval water inlet tooling, and provides a hydraulic pressure clamp with strong adaptability for the same type of tooling.

[0091] The applicant declares that the above description is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily thought of by any person skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A hydraulic clamp, characterized in that: The hydraulic clamp comprises a clamp body, a water inlet arranged on the side of the clamp body, and a water inlet channel arranged inside the clamp body; An elliptical through hole is provided on the surface of the clamp body; and the water inlet is arranged corresponding to the long axis of the elliptical through hole.

2. The hydraulic clamp according to claim 1, characterized in that: The ratio of the length of the major axis to the minor axis of the elliptical through hole is (2.2-2.6):1; Preferably, the elliptical through hole is arranged at a central position of the surface of the clamp body.

3. The hydraulic clamp according to claim 1 or 2, characterized in that: The water inlet channel includes a first water inlet channel and a second water inlet channel, and the first water inlet channel is communicated with the second water inlet channel.

4. The hydraulic clamp according to claim 3, characterized in that: The center lines of the first water inlet channel, the water inlet and the long axis of the elliptical through hole coincide with each other; Preferably, the center lines of the second water inlet channel and the minor axis of the elliptical through hole coincide with each other.

5. The hydraulic clamp according to claim 3, characterized in that: A boss is provided on a side of the second water inlet channel away from the first water inlet channel; Preferably, the boss coincides with a center line of the second water inlet channel.

6. The hydraulic clamp according to claim 5, characterized in that: The ratio of the depth of the boss to the diameter of the second water inlet channel is (0.2-0.5):1; Preferably, the ratio of the width of the boss to the diameter of the second water inlet channel is (1.3-1.6):

1.

7. The hydraulic clamp according to any one of claims 1 to 6, characterized in that: A sealing component is provided around the elliptical through hole; Preferably, the sealing component comprises an annular rubber ring.

8. Use of the hydraulic clamp according to any one of claims 1 to 7, characterized in that: The water pressure fixture is used to clamp the elliptical water inlet fixture to perform a water pressure test.

9. The use of the hydraulic clamp according to claim 8, characterized in that: The elliptical water inlet of the elliptical water inlet tooling has the same size as the elliptical through hole of the hydraulic clamp.

10. Use of the hydraulic clamp according to claim 8 or 9, characterized in that: The elliptical water inlet tooling includes an elliptical water inlet target with a built-in pipeline; Preferably, the water inlet of the pipeline has the same diameter as the second water inlet channel of the hydraulic clamp.

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