A hydraulic tool

Abstract

The present invention relates to a hydraulic tool. The present invention comprises a connecting rod, a connecting piece with an internal cavity detachably fixed to both ends of the connecting rod, a sealing component detachably fixed to the connecting piece and having a built-in cavity connected to an external hydraulic device, the sealing component being fixed to the outer end of the connecting piece opposite to the connecting rod, the built-in cavity being connected to the internal cavity, and the internal cavity having at least one water outlet hole connected to the outside of the connecting piece. The present invention solves the technical problem in the prior art that it is difficult to seal the pipe orifice of the connecting pipe when the inner pipe section of the pipe orifice is short and no block is provided on the outer wall of the pipe orifice, and provides a hydraulic tool for the heating surface tube screen of a waste heat boiler. The present invention has the advantages of simple structure, safety, reliability and ease of use.

Description

Technical Field

[0001] The invention relates to a hydraulic tool, in particular to a hydraulic tool used for a heating surface tube panel of a waste heat boiler, and belongs to the field of power station boiler equipment manufacturing. Background Art

[0002] Waste heat boiler heating surface tube screen (see attached Figure 1 ) Before connecting with other tube panels, a hydraulic test must be carried out as required. During the hydraulic test, both ends of the connecting pipe 801 of the heating surface tube panel of the waste heat boiler must be sealed and at least one end of the pipe must be connected to an external hydraulic device through a hydraulic tool. The hydraulic tool commonly used for sealing and connecting pipes includes an internal expansion plug (see attached Figure 2 ) and large pipe hydraulic tooling (see attached Figure 3 ) two types. Figure 2 It can be seen that the internal expansion plug is fixed to the pipe opening of the connecting pipe 801 by means of expansion connection between the expansion tube 901 and the inner wall of the pipe opening, and the core shaft 902 and the sealing member 903 are inserted into a relatively deep position in the pipe opening (usually about 100 mm from the pipe opening). Therefore, when using the internal expansion plug, the length of the pipe section inside the pipe opening must be more than 100 mm and there must be no other pipe holes on the pipe section to ensure that the expansion tube 901 is firmly expanded and connected to the pipe opening and the sealing member 903 effectively seals the pipe opening; from the attached Figure 3 It can be seen that the large pipe hydraulic tooling is connected to the pipe mouth of the connecting pipe 801 in a flange connection mode when in use, the sealing member 703 blocks the sealing pipe mouth, and the upper flange 701 and the lower flange 702 are connected and fixed to the pipe mouth by means of the stopper 802 arranged on the outer wall of the pipe mouth. However, it is very common that the heating surface pipe 803 of the waste heat boiler heating surface tube panel is located near the pipe mouths at both ends of the connecting pipe 801, so the inner pipe section of the pipe mouth of the connecting pipe 801 is short (less than 100mm) and the stopper cannot be arranged on the outer wall of the pipe mouth. In this case, it is obviously difficult for the internal expansion plug and the large pipe hydraulic tooling to form a sealed and fixed connection with the pipe mouth of the connecting pipe. Therefore, a hydraulic tooling for the heating surface tube panel of the waste heat boiler that can form a sealed and fixed connection with the pipe mouth of the connecting pipe under the condition that the inner pipe section of the pipe mouth is short and the stopper is not arranged on the outer wall of the pipe mouth becomes necessary. Summary of the invention

[0003] The present invention mainly aims to solve the technical problem in the prior art that a hydraulic tool is difficult to form a sealed and fixed connection with the connecting pipe orifice of a waste heat boiler heating surface tube panel under the conditions that the inner pipe section of the pipe orifice is short and no block is provided on the outer wall of the pipe orifice. The present invention provides a hydraulic tool for a waste heat boiler heating surface tube panel that can form a sealed and fixed connection with the connecting pipe orifice under the conditions that the inner pipe section of the pipe orifice is short and no block is provided on the outer wall of the pipe orifice.

[0004] The present invention solves the above-mentioned technical problems mainly through the following technical solutions: the present invention includes a connecting rod, a connecting piece with an internal cavity which is detachably fixed to both ends of the connecting rod, a sealing component with a built-in cavity connected to an external water pressure device which is detachably fixed to the connecting piece, the sealing component is fixed to the outer end of the connecting piece opposite to the connecting rod, the built-in cavity is connected to the internal cavity, and the internal cavity has at least one water outlet hole connected to the outside of the connecting piece.

[0005] Preferably, the sealing component includes a screw connected to the connecting piece in a threaded manner, a positioning piece, a baffle, an elastic sealing piece, a cover plate, and a locking piece which are sequentially sleeved on the screw along the connecting piece outward, and the built-in cavity is an axial through hole passing through the screw.

[0006] Preferably, the cover plate has a truncated cone protruding toward one side of the elastic sealing member, the truncated cone has a diameter equivalent to that of the baffle plate, and the elastic sealing member is formed by stacking a number of rubber circular plates having a diameter equivalent to that of the baffle plate.

[0007] Preferably, the positioning member and the locking member are connected to the screw rod by threads, and the connecting member is connected to the connecting rod by threads.

[0008] Therefore, the present invention has a reasonable structure and has the following advantages:

[0009] In the present invention, two groups of sealing components connected by connecting rods are provided, and the two groups of sealing components are respectively used to seal the two end pipe openings of the connecting pipe on the heating surface tube panel of the waste heat boiler. The connecting rod is of the same length as the connecting pipe and is inserted into the connecting pipe. The sealing component is fixed to the pipe opening of the connecting pipe by means of the connecting rod; the sealing component has a built-in cavity for water intake during a water pressure test, and the built-in cavity is connected to the internal cavity on the connecting piece. Water from an external water pressure device enters the internal cavity through the built-in cavity and is then introduced into the connecting pipe through the water outlet.

[0010] As a preferred embodiment of the present invention, the sealing component includes a screw having an inner end connected to the connecting piece and an outer end connected to the external hydraulic device. During the hydraulic test, water from the external hydraulic device is introduced into the connecting pipe through the axial through hole penetrating the screw and the water outlet hole on the connecting piece.

[0011] A positioning piece, a baffle, an elastic seal, a cover plate and a locking piece are sequentially sleeved on the upper edge of the screw toward the outside of the connecting piece; among them, the positioning piece is used for positioning the baffle and the elastic seal, and the positioning piece can adopt a nut matching the screw; the diameters of the baffle and the elastic seal match the inner diameter of the connecting pipe opening on the heating surface tube panel of the waste heat boiler, and are used for plugging and sealing the pipe opening; the cover plate is used for sealing the pipe opening and is locked and fixed by the locking piece, and the elastic seal is clamped by the cover plate and the baffle to play a sealing role, and the locking piece can adopt a nut matching the screw.

[0012] During the water pressure test, the screw is fixed to the two ends of the connecting rod through the connecting parts, the connecting rod is inserted into the connecting pipe, the baffle and elastic sealing parts mounted on the screw are respectively blocked at the two end pipe openings of the connecting pipe, the cover plates mounted on the screw are respectively sealed on the two end pipe openings of the connecting pipe and are locked and fixed by locking parts, and the two groups of sealing components form a sealed and fixed connection with the pipe openings at both ends of the connecting pipe with the help of the connecting rod; the outer end of the screw is connected to the external water pressure device, and the water from the external water pressure device enters the connecting pipe through the axial through hole on the screw and the water outlet hole on the connecting part; when the water pressure increases, the axial pressure acting on the baffle is borne by the connecting rod.

[0013] As a preferred embodiment of the present invention, the cover plate has a protruding frustum, and when the cover plate seals the pipe opening of the connecting pipe, the frustum extends into the pipe opening to clamp the elastic sealing member. When the diameter of the frustum is equivalent to the inner diameter of the connecting pipe, the frustum cooperates with the pipe opening to prevent the cover plate from circumferential displacement at the pipe opening. The elastic sealing member is formed by stacking a number of rubber circular plates, and the thickness of the elastic sealing member can be adjusted by adding or reducing the rubber circular plates to adapt to the length of the pipe section inside the pipe opening.

[0014] As a preferred embodiment of the present invention, the positioning member and the locking member are connected to the screw by threads, which can simplify the structure of the sealing component and reduce the manufacturing cost; the connecting member and the end of the connecting rod are connected by threads, and the total length of the connecting rod after the connection with the connecting member can be adjusted within the length range limited by the connecting thread.

[0015] Therefore, the present invention solves the technical problem that the hydraulic tooling is difficult to form a sealed fixed connection with the connecting pipe orifice under the condition that the inner pipe section of the pipe orifice is short and the outer wall of the pipe orifice is not provided with a block, and provides a hydraulic tooling for the heating surface tube panel of the waste heat boiler. The present invention has the advantages of simple structure, safety, reliability and convenience in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 This is a schematic diagram of the heating surface tube panel of the waste heat boiler;

[0017] Attached Figure 2 It is a schematic diagram of the structure of the inner expansion plug;

[0018] Attached Figure 3 It is a structural diagram of a large-pipe hydraulic tooling;

[0019] Attached Figure 4 It is a structural schematic diagram of a preferred embodiment of the present invention;

[0020] Attached Figure 5 Yes Figure 4 The assembly diagram of a preferred embodiment of the present invention is shown;

[0021] Attached Figure 6 Yes Figure 4 A schematic diagram of the use status of a preferred embodiment of the present invention is shown.

[0022] Explanation of the reference numerals: 1-connecting rod; 2-connecting piece; 21-water outlet; 22-internal cavity; 3-sealing component; 31-screw; 32-baffle; 33-cover plate; 331-table; 34-elastic sealing member; 35-positioning member; 36-locking member; 37-internal cavity; 701-upper flange; 702-lower flange; 703-sealing member; 801-connecting pipe; 802-block; 803-heating surface pipe; 901-expansion tube; 902-core shaft; 903-sealing member. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0024] Embodiment 1: As attached Figure 1 , Attachment Figure 4 , Attachment Figure 5 , Attachment Figure 6 As shown, the present invention comprises a connecting rod 1, connecting members 2 fixed at both ends of the connecting rod 1, a sealing member 3 fixedly connected to the connecting rod 1 through the connecting member 2, the sealing member 3 having a built-in cavity 37 connected to an external water pressure device, and the connecting member 2 having an internal cavity 22 and a water outlet 21;

[0025] The connecting member 2 is connected to the connecting rod 1 and the screw rod 31 respectively by screw connection, and the internal cavity 22 and the water outlet 21 are located between the connecting rod 1 and the screw rod 31;

[0026] The sealing component 3 includes a screw 31, a positioning member 35, a baffle 32, an elastic sealing member 34, a cover plate 33, and a locking member 36 which are sequentially sleeved on the screw 31 along the connecting member 2. External threads are arranged at both ends of the screw 31. The positioning member 35 and the locking member 36 use nuts that match the external threads on the screw 31. The built-in cavity 37 is an axial through hole that passes through the screw 31 and communicates with the internal cavity 22. The baffle 32 is a circular plate with a diameter equivalent to the inner diameter of the connecting pipe 801.

[0027] The cover plate 33 has a protruding truncated cone 331 on one side facing the elastic sealing member 34, and the diameter of the truncated cone 331 is comparable to that of the baffle plate 32;

[0028] The elastic sealing member 34 is formed by stacking rubber circular plates having a diameter equivalent to that of the baffle plate 32 .

[0029] When the present invention is used, first select a connecting rod 1 of a suitable length according to the length of the connecting tube 801, install the connecting pieces 2 at both ends of the connecting rod 1 respectively, and adjust the total length after connection by rotating the connecting piece 2, install the positioning piece 35, the baffle 32, and the elastic seal 34 on the screw 31 in sequence, and then screw the inner end of the screw 31 close to the positioning piece 35 to the connecting piece 2; insert the connecting rod 1 and the screw 31 connected as a whole into the connecting tube 801, and adjust the positions of the baffle 32 and the elastic seal 34 on the screw 31 by rotating the positioning piece 35 so that the baffle 32 and the elastic seal 34 are located at the pipe opening of the connecting tube 801 The cover plate 33 and the locking piece 36 are installed on the screw rod 31, and the outer end of the screw rod 31 exposed on the connecting pipe 801 is connected to the external hydraulic device. The water from the external hydraulic device enters the connecting pipe 801 through the axial through hole and the water outlet hole 21 on the screw rod 31. When the water in the heating surface tube panel of the waste heat boiler is about to be filled, the cover plate 33 is pushed to make the round table 331 embedded in the connecting pipe 801 to clamp the elastic sealing member 34, and then the cover plate 33 is locked by the locking piece 36. When the cover plates 33 on the pipe openings at both ends of the connecting pipe 801 are locked, the hydraulic test can be started.

[0030] Of course, the above drawings and embodiments are only used to explain and illustrate the present invention, and cannot be used as improper limitations of the present invention. Any technical solutions obtained by those skilled in the art making equivalent adjustments and changes based on the present invention fall within the protection scope of the present invention.

Claims

1. A hydraulic tool, comprising a connecting pipe (801) and a heating surface pipe (803), characterized in that: The invention comprises a connecting rod (1), a connecting member (2) having an internal cavity (22) fixed to both ends of the connecting rod (1) in a detachable manner, and a sealing member (3) having a built-in cavity (37) connected to an external water pressure device and fixed to the connecting member (2) in a detachable manner, wherein the sealing member (3) comprises a screw (31), the sealing member (3) is fixed to the outer end of the connecting member (2) opposite to the connecting rod (1), the built-in cavity (37) is connected to the internal cavity (22), and the internal cavity (22) has at least one connecting portion connected to the external water pressure device. The water outlet (21) is outside the connecting piece (2); the connecting piece (2) is connected to the connecting rod (1) by screw connection; a positioning piece (35), a baffle (32), an elastic sealing piece (34), a cover plate (33), and a locking piece (36) are sequentially sleeved on the screw rod (31) along the connecting piece (2) outward, and the position of the baffle (32) and the elastic sealing piece (34) on the screw rod (31) is adjusted by rotating the positioning piece (35) so that the baffle (32) and the elastic sealing piece (34) are located inside the pipe mouth of the connecting pipe (801) and outside the pipe mouth of the heating surface pipe (803).

2. A hydraulic tool according to claim 1, characterized in that: The sealing component (3) comprises a screw rod (31) which is connected to the connecting piece (2) in a threaded manner, and the built-in cavity (37) is an axial through hole that penetrates the screw rod (31).

3. A hydraulic tool according to claim 2, characterized in that: The cover plate (33) has a truncated cone (331) protruding toward one side of the elastic sealing member (34); the truncated cone (331) has a diameter equivalent to that of the baffle plate (32); and the elastic sealing member (34) is formed by stacking a plurality of rubber circular plates having a diameter equivalent to that of the baffle plate (32).

4. A hydraulic tool according to claim 2 or 3, characterized in that: The positioning member (35) and the locking member (36) are connected to the screw rod (31) by threads, and the connecting member (2) is connected to the connecting rod (1) by threads.

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