Corrugated pipe wave knocking device

Abstract

The utility model discloses a corrugated pipe wave knocking device, and belongs to the technical field of corrugated pipe joint installation tools. The device comprises a connector, wherein a die cavity for accommodating and clamping the end part of the corrugated pipe is formed in the connector; the hydraulic working head comprises a shell and a piston rod arranged in the shell; wherein the end part of the piston rod can extend into the die cavity and extrude a wave crest of the end part of the corrugated pipe clamped in the die cavity. According to the corrugated pipe wave knocking device, the hydraulic principle is used for conducting extrusion wave making, and compared with a traditional hammer for wave knocking, the operation difficulty is greatly lowered, more labor is saved, and efficiency is higher; and meanwhile, the space required by waving the hammer is avoided, so that the hammer can be suitable for operation in a narrow space. In addition, the one-time installation success rate of the corrugated pipe can be greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bellows joint installation tools, and more specifically relates to a bellows knocker. Background Art

[0002] Metal bellows are pipes with a regular, wavy appearance. They are primarily used for applications requiring small bend radius, non-concentric axial transmission, irregular turns, expansion and contraction, and to absorb thermal deformation. During gas pipeline installation, metal bellows are often used to connect gas appliances. On-site corrugated pipes of varying lengths are often required based on actual needs. In this case, the required lengths must be cut from the coil; the cut ends are then tapped to facilitate later nut assembly. The specific steps include removing the outer covering of the bellows with a stripping knife; cutting with a cutter, leaving approximately five corrugations from the outer covering; attaching a tapper to insert two to three corrugations; tapping with a hammer; installing the connector, retaining the retaining ring, and gasket; and finally, testing the tightness of the bellows connection by applying and maintaining pressure.

[0003] Because traditional bellows tapping methods rely on hammering, they are relatively cumbersome, physically demanding, and inefficient. This difficulty is exacerbated when working in confined spaces. Operators can easily injure themselves. Furthermore, the limited space significantly increases the risk of bellows installation failure. Therefore, designing a bellows tapper that is easy to use, labor-saving, and suitable for use in confined spaces is of great practical significance.

[0004] A search revealed a new type of corrugated pipe flattening device, disclosed in patent CN204583962U. This device features a longer pressure rod and a matching housing. A handle controls the rod's sliding motion within a slot in the housing, achieving a specific impact force. This allows the device to flatten the end surface of a corrugated pipe without the aid of tools.

[0005] For example, patent CN208179416U discloses a hammer-free two-in-one corrugated pipe tapping device. This application is suitable for connecting both 4-inch and 6-inch corrugated pipes. The device also allows for quick and easy switching between die heads. It also changes the traditional hammer-like striking mode to a long handle for both left and right strokes, making operation more convenient and user-friendly. The device is also highly safe and user-friendly.

[0006] The above designs optimize the structure of the bellows pulsator from different directions, but the industry still needs more diverse designs to solve the problem that the bellows pulsating operation is relatively cumbersome and inefficient. Utility Model Content

[0007] 1. Problems to be solved

[0008] In view of at least some of the problems existing in the above-mentioned prior art, the present invention proposes a bellows knocker, the purpose of which is to solve the problems of the existing bellows knocker, which is relatively cumbersome to operate and has low efficiency.

[0009] 2. Technical solution

[0010] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0011] The utility model is a bellows knocker, which is characterized by comprising a connector,

[0012] The connector has a cavity for accommodating and clamping the end of the corrugated pipe;

[0013] and hydraulic working heads,

[0014] The hydraulic working head comprises a housing and a piston rod arranged in the housing; wherein the end of the piston rod can extend into the mold cavity and squeeze the wave crest of the end of the bellows clamped in the mold cavity.

[0015] Furthermore, the connecting head includes an upper die head and a lower die head that are hinged to each other; wherein, the upper die head or the lower die head is connected to the end of the shell; after the upper and lower die heads are closed, the mold cavity is formed, and the mold cavity is cylindrical as a whole.

[0016] Furthermore, the inner walls of the upper die head and the lower die head are both provided with semicircular limiting rings; after the upper and lower die heads are closed, the two limiting rings are jointly clamped at the same trough of the corrugated pipe to limit the position of the corrugated pipe.

[0017] Furthermore, the contact surfaces of the upper and lower die heads are clamped to each other via protrusions and clamping grooves.

[0018] Furthermore, the shell is provided with an upper handle and a lower handle, and both the upper and lower handles are covered with anti-slip sleeves.

[0019] Furthermore, the shell is provided with an oil return switch, and the oil return switch is arranged on the outer peripheral wall of the connection between the upper handle and the shell.

[0020] Furthermore, the connecting head and the hydraulic working head are connected by welding.

[0021] Furthermore, the connecting head and the hydraulic working head are detachably connected by means of threads or clamping.

[0022] 3. Beneficial effects

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] (1) The utility model relates to a bellows knocker, wherein a connector is connected to a hydraulic working head, and the piston rod of the hydraulic working head can extend into the mold cavity of the connector. The piston rod squeezes the wave crest of the end of the bellows clamped in the mold cavity to form a flat connection end. The utility model uses the hydraulic principle to squeeze and generate waves. Compared with the traditional hammer, the operation difficulty is much simpler, and it is more labor-saving and efficient. At the same time, it avoids the space required for swinging the hammer, so it is suitable for operations in small spaces.

[0025] (2) The utility model relates to a bellows knocker, wherein the inner walls of the upper die head and the lower die head are both provided with semicircular limiting rings; after the upper and lower die heads are closed, the two limiting rings are jointly clamped at the same wave trough of the bellows to limit the position of the bellows, which can effectively ensure the stability of the bellows during the process of being squeezed and waved.

[0026] (3) The bellows knocker of the utility model is provided with an upper handle and a lower handle on the shell. By pressing the upper handle to drive the piston rod to squeeze the end of the bellows to produce waves, single-handed operation can be achieved. Construction operations can be carried out wherever the operator's arm can reach, so it is suitable for operations in some extreme spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of a bellows knocker according to the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the upper and lower touch heads of the utility model after they are opened.

[0029] In the figure: 1, connector; 11, upper die head; 12, lower die head; 13, limit ring;

[0030] 2. Hydraulic working head; 21. Housing; 22. Piston rod; 23. Upper handle; 24. Oil return switch; 25. Anti-slip sleeve; 26. Lower handle. DETAILED DESCRIPTION

[0031] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings.

[0032] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] The present invention will be further described below in conjunction with specific embodiments.

[0034] like Figure 1 、 Figure 2 As shown, a bellows knocker of the present embodiment includes a connector 1 and a hydraulic working head 2 which are interconnected. The connector 1 has a mold cavity for accommodating and clamping the end of the bellows. The hydraulic working head 2 has a hydraulic system, through which the piston rod 22 can be driven to extend into the mold cavity of the connector 1, and the wave crest of the end of the bellows clamped in the mold cavity is squeezed to form a flat connecting end. The bellows knocker of the present embodiment uses the hydraulic principle to squeeze the wave crest of the end of the bellows to generate waves. Compared with the traditional hammer for knocking waves, the operation difficulty is much simpler, and it is more labor-saving and efficient. At the same time, the space required for swinging the hammer is avoided, so it is suitable for operations in a small space.

[0035] Specifically, the connecting head 1 includes an upper die head 11 and a lower die head 12 that are hinged to each other. Among them, the upper and lower die heads are both hollow semi-cylindrical structures. After the upper and lower die heads are closed, the above-mentioned mold cavity is formed, and the mold cavity as a whole is a hollow cylindrical shape. The upper die head 11 or the lower die head 12 is connected to the end of the shell 21. At the same time, a semicircular limiting ring 13 is provided on the inner wall of the upper die head 11 and the lower die head 12. After the upper and lower die heads are closed, the two limiting rings 13 are jointly clamped at the same trough of the corrugated pipe to limit the position of the corrugated pipe.

[0036] In this embodiment, the positioning ring 13 effectively prevents the bellows from dislodging from the inner cavity during the extrusion and wave-making process, thereby ensuring the stability of the bellows during the extrusion and wave-making process. Furthermore, the pins can be used to lock the upper and lower dies after they are closed, ensuring their stability.

[0037] Specifically in this embodiment, the end of the lower die head 12 and the end of the hydraulic working head 2 are connected by welding. Of course, threaded, clamping or other forms of detachable connection can also be used. At the same time, a protrusion (not shown in the figure) is provided on the contact end face of the upper die head 11 (that is, the surface where the upper and lower die heads contact each other after the mold is closed); a groove (not shown in the figure) is provided on the contact end face of the lower die head 12. After the upper and lower die heads are closed, the protrusion is just snapped into the groove, and the contact end faces of the upper and lower die heads fit together to complete the positioning and closing of the upper and lower die heads. Through the mutual cooperation of the protrusion and the groove, the accuracy of the relative position of the upper and lower die heads after the mold is closed can be guaranteed, thereby ensuring that the upper and lower limit rings 13 can form a whole and are just stuck in the same trough of the bellows.

[0038] A bellows tapper of this embodiment, such as Figure 2 As shown, the hydraulic working head 2 includes a housing 21 , a piston rod 22 is disposed in the housing 21 , and an output end of the piston rod 22 can freely pass through the end of the housing 21 and extend into the mold cavity of the connecting head 1 .

[0039] An upper handle 23 is located near the rear end of the housing 21 (the end away from the connector). Pressing this handle activates the piston rod 22 in the hydraulic system. A non-slip cover 25, such as a rubber or silicone sleeve, is placed over the upper handle 23 to facilitate gripping and pressing. Furthermore, an oil return switch 24 is located on the outer wall where the upper handle 23 connects to the housing 21. This allows for quick release of pressure in the hydraulic system, allowing the piston rod 22 to return to its original position.

[0040] In this embodiment, one-handed operation can be achieved by pressing the upper handle 23 to drive the piston rod 22 to squeeze the end of the bellows to generate waves. Construction operations can be performed wherever the operator's arm can reach, so it can be applied to work needs in some extreme spaces. At the same time, in order to further facilitate the operator's one-handed pressing, a lower handle 26 is added to the end of the shell 21 for the operator to hold. Of course, the anti-slip cover 25 can also be provided on the lower handle 26. At the same time, it should be noted that if the length of the shell 21 is long enough, the upper handle 23 can be set near the middle of the shell 21, and the tail of the shell 21 can be used directly as the lower handle 26.

[0041] The bellows tapper of the present embodiment has the following working process and principle: place the end of the bellows in the lower die head 12, and ensure that the limiting ring 13 in the lower die head 12 is stuck in the bellows at least the second trough away from the end; rotate the upper die head 11 to complete the mold closing operation of the upper and lower die heads; at this time, the end of the bellows is limited in the mold cavity by the limiting ring 13. Then, press the upper handle 23, and use the hydraulic system in the hydraulic working head 2 to push the piston rod 22 into the mold cavity to squeeze the wave peak at the end of the bellows to form a flat connecting end. Then, turn the return oil switch 24, and the piston rod 22 returns to its position; finally, open the mold cavity and take out the bellows that have completed wave making. It should be noted that the hydraulic working head and its pressing system in the present embodiment are both existing technologies.

[0042] In addition, six consecutive months of data were collected for the improved bellows tapper of this embodiment and the traditional bellows tapper for comparative analysis.

[0043] Table 1. Success rate of traditional knocker installation for 6 consecutive months

[0044]

[0045]

[0046] Table 2. Statistics of reasons for failure of traditional knocker installation within 6 consecutive months

[0047] project Frequency Proportion Knock waves causing damage 478 87.55％ Damage caused by cutting knife 20 3.66％ Damage caused by installation 15 2.75％ damage caused by peeling 12 2.20％ other 21 3.85％

[0048] Table 3. Success rate of installation of the knocker for 6 consecutive months after the improvement of this application

[0049] Times / month Number of completed installations Amount of successful suppression Installation success rate 1 1543 1409 91.32％ 2 1655 1523 92.02％ 3 1492 1344 90.08％ 4 1737 1568 90.27％ 5 1253 1165 92.98％ 6 648 584 90.12％ total 8328 7593 91.17％

[0050] Table 4. Statistics of reasons for failure of installation of the knocker within 6 consecutive months after the improvement of this application

[0051] project Frequency Proportion Knock waves causing damage 213 65.74％ Damage caused by cutting knife 41 12.65％ Damage caused by installation 23 7.10％ damage caused by peeling 14 4.32％ other 33 10.19％

[0052] As can be seen from Tables 1-4 above, the total number of installations of the traditional knocker within 6 months was 3443, of which 2897 were successful in one-time pressure testing, and the average success rate of one-time installation was 84.14%. Among the failures in one-time pressure testing, the number of damages caused by the knocker was 478 times, accounting for 87.55%. The total number of installations of the improved knocker within 6 months was 8328, of which 7593 were successful in one-time pressure testing, and the average success rate of one-time installation was increased to more than 90.00%. At the same time, among the failures in one-time pressure testing, the number of damages caused by the knocker was 213 times, accounting for 65.74%, which is significantly lower than the traditional 87.55%.

[0053] Thus, it can be seen that the bellows tapper of the present invention utilizes the hydraulic principle to squeeze and generate waves. Compared with the traditional hammer tapping method, it not only reduces the difficulty of operation and improves work efficiency, but also greatly increases the success rate of the first installation. In short, the bellows tapper of the present application has achieved significant improvements in both installation efficiency and installation success rate, thereby providing customers with more efficient and high-quality services and significantly improving customer satisfaction.

[0054] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the inventive purpose of the present invention, designs a structure and embodiment similar to the technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A bellows tapper, characterized in that: including a connector (1), The connector (1) has a mold cavity for accommodating and clamping the end of the corrugated pipe; and a hydraulic working head (2), The hydraulic working head (2) comprises a housing (21) and a piston rod (22) arranged in the housing (21); wherein the end of the piston rod (22) can extend into the mold cavity and squeeze the peak of the end of the bellows clamped in the mold cavity.

2. The bellows tapper according to claim 1, characterized in that: The connecting head (1) comprises an upper die head (11) and a lower die head (12) which are hinged to each other; wherein the upper die head (11) or the lower die head (12) is connected to the end of the shell (21); after the upper and lower die heads are combined, the mold cavity is formed, and the mold cavity is cylindrical as a whole.

3. The bellows tapper according to claim 2, characterized in that: The inner walls of the upper die head (11) and the lower die head (12) are both provided with a semicircular limiting ring (13); after the upper and lower die heads are closed, the two limiting rings (13) are jointly clamped at the same trough of the corrugated pipe to limit the position of the corrugated pipe.

4. The bellows tapper according to claim 3, characterized in that: The contact surfaces of the upper and lower die heads are clamped to each other via protrusions and clamping grooves.

5. A bellows tapper according to any one of claims 1 to 4, characterized in that: The housing (21) is provided with an upper handle (23) and a lower handle (26), and both the upper and lower handles are covered with anti-slip sleeves (25).

6. The bellows tapper according to claim 5, characterized in that: The housing (21) is provided with an oil return switch (24), and the oil return switch (24) is arranged on the outer peripheral wall of the connection between the upper handle (23) and the housing (21).

7. A bellows tapper according to any one of claims 1 to 4, characterized in that: The connecting head (1) and the hydraulic working head (2) are connected by welding.

8. A bellows tapper according to any one of claims 1 to 4, characterized in that: The connecting head (1) and the hydraulic working head (2) are detachably connected via threads or clamping.

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