A special extrusion device for pipe fittings

Abstract

The present invention discloses a special extrusion device for matching pipe fittings, belonging to the engineering field of pipe fitting connection technology. The special extrusion device includes an upper grinding head, a lower grinding head, an upper grinding head seat, a base and a power device. There are N raised ribs on the inner walls of the upper grinding head and the lower grinding head. During extrusion, the upper grinding head and the lower grinding head are butted from the upper and lower directions, and the inner walls of the two grinding heads form a cylindrical pipe fitting accommodating area. Through the present invention, it is possible to implement the extrusion of thin-walled ribbed pipe fittings, steel-plastic composite pipe fittings, pipe fittings and outer sleeve fittings sleeved thereon, especially when the latter two are extruded, the pipe fittings and their molding layers, the pipe fittings and the outer sleeve can all produce uniform deformation, so that the inner and outer pipe fittings are firmly connected together, which well solves the problems of unreliability, deformation, water leakage when connecting thin-walled pipe fittings, steel-plastic pipe fittings, and pipe fittings and outer sleeves.

Description

Technical Field

[0001] The invention relates to the field of pipe fitting connection engineering, and in particular to a special extrusion device for matching pipe fittings, so as to realize extrusion matching of accessories on pipe fittings and the like. Background Art

[0002] At present, a considerable number of acoustic detection pipes and grouting pipes used for pile foundation detection are made of thin-walled steel pipes with a wall thickness of 1.0 mm to 2.0 mm. In order to prevent water leakage, the outer connecting pipe has two ribs protruding outward, and sealing rings are placed inside the ribs. For this kind of pipe fittings, the common method is to use hydraulic pliers with grooves to squeeze and connect them. After connection, the water leakage performance is better, but the pulling performance is poor. The two sections of the pipe are often easy to be disconnected during the lifting process, which seriously affects the quality.

[0003] Recently, a steel-plastic composite acoustic detection pipe has been developed. The steel-plastic composite acoustic detection pipe is a steel pipe with a layer of plastic on the outside. The plastic layer is equivalent to the role of a sealing ring, and an outer sleeve is used to connect two plastic-steel acoustic detection pipes. For this kind of pipe fitting, if the above-mentioned hydraulic pliers are used for construction, the water-stopping effect can be achieved, but the pulling force is far from enough and cannot reach the required 3000N, which seriously affects the quality of the acoustic detection pipe.

[0004] In addition, different molds need to be made for pipes of different diameters, which is inconvenient to use and relatively costly.

[0005] Therefore, how to develop a hydraulic pliers that is convenient for extrusion, can use a removable extrusion die according to different pipe diameters, increase the extrusion force, and deform both inside and outside the pipe, so as to achieve the purpose of water stopping and have a pulling force of more than 3000N, is a technical problem that urgently needs to be solved. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the problems existing in the prior art and provide an extrusion device with reasonable structure, convenient extrusion, reliable pipe connection, low cost and reusable.

[0007] The object of the present invention is achieved in this way.

[0008] The present invention provides a special extrusion device for pipe fittings, comprising an upper grinding head, a lower grinding head, an upper grinding head seat, a base and a power device; the upper grinding head and the lower grinding head are both semi-cylindrical, and have N raised ribs on the inner wall; during extrusion, the upper grinding head and the lower grinding head are butted from the upper and lower directions, and the inner walls of the two grinding heads form a cylindrical pipe fitting accommodating area;

[0009] The cross-section of the upper grinding head seat is an inverted U-shape, that is, the upper grinding head seat is composed of a circular arc body and two rectangular bodies on both sides, and a through hole A is opened near the lower end surface of the two rectangular bodies; the upper grinding head is embedded in the inner side of the circular arc body part of the upper grinding head seat;

[0010] The base includes a base body, two connecting pieces and two base supporting arms. The base body is cylindrical, with an extrusion channel in the middle for the extrusion head to pass through. The connecting piece is a concave piece, and through holes B corresponding to each other are opened on two sides of the concave piece. The two base supporting arms are installed on both sides of the center line of the upper end surface of the base body and are inclined to the outside of the center line at an inclination angle α. The two connecting pieces are respectively installed on the top of the two base supporting arms;

[0011] The lower grinding head is located on the upper end surface of the base body, and the space formed by the base body and the two base supporting arms and the outer contact space of the lower grinding head is recorded as space A, and the outer side of the lower grinding head is consistent with the shape of space A;

[0012] The inclination angle α is selected as follows: the two rectangular bodies in the upper grinding head seat are completely embedded in the two connecting pieces from top to bottom, and the through hole A on the upper grinding head seat is exactly aligned with the through hole B on the connecting piece, and then a pin is passed through the aligned through hole A and through hole B, and locked with a retaining spring. At this time, the upper grinding head and the lower grinding head are butted from both the upper and lower directions, and the inner walls of the two grinding heads form a pipe accommodating area;

[0013] When working, the extrusion head in the power device is pushed by the power to pass through the base body upward through the extrusion channel, exert an upward force on the bottom of the lower grinding head, and extrude the pipe fitting.

[0014] Preferably, the number of the convex ribs is 2-4, and the width and height of each convex rib are both 1mm-4mm.

[0015] Preferably, the upper grinding head and the lower grinding head are both replaceable serial products.

[0016] Preferably, an internal thread is provided on the inner wall of the lower part of the extrusion channel for connection with a power device. The power device is a pneumatic device, including a cylinder, an extrusion head, a spring and an air pump. An external thread is provided on the outer wall of the cylinder, and the cylinder is connected to the base body through the external thread. The spring is installed in the extrusion channel, and the extrusion head moves upward through the spring when working.

[0017] Compared with the prior art, the beneficial effects of the present invention include:

[0018] 1. The problem of extrusion of the connecting joints of the steel-plastic composite acoustic testing pipe is solved by setting the convex ribs on the grinding head.

[0019] 2. The pipe fittings at the rib position are subjected to large forces, which are gentle and uniform, and deformed. In particular, by using the present invention to extrude pipe fittings similar to the steel-plastic composite acoustic detection pipe, the inner pipe fittings, plastic, and outer sleeve can all produce the same deformation, and the plastic acts as a sealing ring, so that the pipe fittings are more securely connected, the water-stopping effect is better, and the pulling force of the pipe fittings is greater than 3000N.

[0020] 3. The grinding head is detachable and can be easily replaced to meet the needs of various pipe connections. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure when two grinding heads are butt-jointed in an embodiment of the present invention.

[0022] Figure 2 Schematic diagram of the structure of the grinding head in an embodiment of the present invention.

[0023] Figure 3 for Figure 2 Left view of .

[0024] Figure 4 It is a schematic diagram of the structural decomposition of an embodiment of the present invention.

[0025] Figure 5 Schematic diagram of the operation of the power device in an embodiment of the present invention.

[0026] Among them, 1-upper grinding head, 2-lower grinding head, 3-upper grinding head seat, 4-base, 5-base body, 6-connecting piece, 7-base support arm, 8-pin, 9-extrusion head, 10-groove, 11-circlip, 12-through hole A, 13-through hole B, 14-pipe accommodating area, 15-extrusion channel, 16-spring, 17-cylinder. DETAILED DESCRIPTION

[0027] Figure 1 is a schematic diagram of the structure of two grinding heads when they are butted together in an embodiment of the present invention, Figure 1 It can be seen that the special extrusion device for pipe fittings in the present invention comprises an upper grinding head 1, a lower grinding head 2, an upper grinding head seat 3, a base 4 and a power device. The upper grinding head 1 and the lower grinding head 2 are both semi-cylindrical, and have N raised ribs 10 on the inner wall. During extrusion, the upper grinding head 1 and the lower grinding head 2 are butted from the upper and lower directions, and the inner walls of the two grinding heads form a cylindrical pipe fitting accommodating area 14.

[0028] The number of the convex ribs 10 is 2-4, and the width and height of each convex rib 10 are both 1mm-4mm. Figure 2 is a schematic diagram of the structure of the grinding head in an embodiment of the present invention, Figure 3 for Figure 2 The left view of the rib gives the depth and width of the rib. Figure 2 and Figure 3 It can be seen that in this embodiment, the number of ribs 10 is 3. Specifically, the width C and height H of each rib 10 are both 2 mm. Figure 2 L in the figure is the width of the grinding head. In this embodiment, L is less than 40 mm.

[0029] Figure 4 FIG. 1 is a schematic diagram of the structure decomposition of an embodiment of the present invention. Figure 4 It can be seen that the cross-sectional shape of the upper grinding head seat 3 is an inverted U shape, that is, the upper grinding head seat 3 is composed of a circular arc body and two rectangular bodies on both sides, and a through hole A12 is opened on the two rectangular bodies near the lower end surface; the upper grinding head 1 is embedded in the inner side of the circular arc body part of the upper grinding head seat 3.

[0030] The base includes a base body 5, two connecting members 6 and two base supporting arms 7. The base body 5 is cylindrical, with an extrusion channel 15 in the middle for the extrusion head 9 to pass through, the connecting member 6 is a concave member, and through holes B13 corresponding to each other are opened on two sides of the concave member, the two base supporting arms 7 are installed on both sides of the center line of the upper end surface of the base body 5, and are inclined to the outside of the center line at an inclination angle α, and the two connecting members 6 are installed on the top of the two base supporting arms 7 respectively.

[0031] The lower grinding head 2 is located on the upper end surface of the base body 5. The space formed by the base body 5 and the two base supporting arms 7 and the outer contact space of the lower grinding head 2 is recorded as space A, and the outer side of the lower grinding head 2 is consistent with the shape of space A.

[0032] The selection of the inclination angle α is as follows: the two rectangular bodies in the upper grinding head seat 3 are completely embedded in the two connecting pieces 6 from top to bottom, and the through hole A12 on the upper grinding head seat 3 is exactly aligned with the through hole B13 on the connecting piece 6, and then the pin 8 is passed through the aligned through hole A12 and through hole B13, and locked with the retaining spring 11. At this time, the upper grinding head 1 and the lower grinding head 2 are connected from the upper and lower directions, and the inner walls of the two grinding heads form a pipe accommodating area 14.

[0033] When working, the extrusion head 9 in the power device is driven by the power to pass through the base body 5 upward through the extrusion channel 15, exert an upward force on the bottom of the lower grinding head 2, and implement extrusion of the pipe fitting.

[0034] In a specific implementation, the upper grinding head 1 and the lower grinding head 2 are both replaceable serial products.

[0035] In a specific implementation, the power device can be a pneumatic device or an electric device. Figure 5 The specific structure of the pneumatic device as the power device is given. Figure 5Yes, an internal thread is provided on the inner wall of the lower part of the extrusion channel 15 of the base body 5 for connection with the power device. The power device is a pneumatic device, including a cylinder 17, an extrusion head 9, a spring 16 and an air pump. An external thread is provided on the outer wall of the cylinder 17, and the cylinder 17 is connected to the base body 5 through the external thread. The spring 16 is installed in the extrusion channel 15. The air pump pushes the extrusion head to move upward. When the extrusion head 9 is working, it moves upward through the spring 16. When the extrusion is finished, the spring 16 realizes the reset of the extrusion head.

[0036] Through the invention, it is possible to implement extrusion of thin-walled ribbed pipe fittings, steel-plastic composite pipe fittings, pipe fittings and outer sleeve fittings thereon, especially when extruding the latter two types, the pipe fittings and their molding layers, the pipe fittings and the outer sleeve can all produce uniform deformation, so that the inner and outer pipe fittings are firmly connected together, which effectively solves the problems of unreliability, deformation, leakage, etc. when connecting thin-walled pipe fittings, steel-plastic pipe fittings, and pipe fittings and outer sleeves.

Claims

1. A special extrusion device for pipe fittings, characterized in that: The invention comprises an upper grinding head (1), a lower grinding head (2), an upper grinding head seat (3), a base (4) and a power device; the upper grinding head (1) and the lower grinding head (2) are both semi-cylindrical, and have N raised ribs (10) on the inner wall; during extrusion, the upper grinding head (1) and the lower grinding head (2) are butted from the upper and lower directions, and the inner walls of the two grinding heads form a cylindrical pipe accommodating area (14); The cross-sectional shape of the upper grinding head seat (3) is an inverted U-shape, that is, the upper grinding head seat (3) is composed of a circular arc body and two rectangular bodies on both sides, and through holes A (12) are opened near the lower end surfaces of the two rectangular bodies; the upper grinding head (1) is embedded in the inner side of the circular arc body part of the upper grinding head seat (3); The base (4) comprises a base body (5), two connecting pieces (6) and two base supporting arms (7); the base body (5) is cylindrical and has an extrusion channel (15) in the middle for the extrusion head (9) to pass through; the connecting piece (6) is a concave piece and has through holes B (13) corresponding to each other on two sides of the concave piece; the two base supporting arms (7) are mounted on both sides of the center line of the upper end surface of the base body (5) and are respectively inclined toward the outside of the center line at an inclination angle α; the two connecting pieces (6) are respectively mounted on the top of the two base supporting arms (7); The lower grinding head (2) is seated on the upper end surface of the base body (5), and the space formed by the base body (5) and the two base supporting arms (7) and the outer contact space of the lower grinding head (2) is recorded as space A, and the outer side of the lower grinding head (2) is consistent with the shape of space A; The inclination angle α is selected as follows: the two rectangular bodies in the upper grinding head seat (3) are completely embedded in the two connecting pieces (6) from top to bottom, and the through hole A (12) on the upper grinding head seat (3) is exactly aligned with the through hole B (13) on the connecting piece (6), and then a pin (8) is passed through the aligned through hole A (12) and through hole B (13), and locked with a retaining spring (11). At this time, the upper grinding head (1) and the lower grinding head (2) are butt-jointed from both the upper and lower directions, and the inner walls of the two grinding heads form a pipe accommodating area (14); When working, the extrusion head (9) in the power device is driven by power to pass through the base body (5) upward through the extrusion channel (15), exert an upward force on the bottom of the lower grinding head (2), and extrude the pipe fitting.

2. A special extrusion device for pipe fittings according to claim 1, characterized in that: The number of the convex ribs (10) is 2-4, and the width and height of each convex rib (10) are both 1mm-4mm.

3. A special extrusion device for pipe fittings according to claim 1, characterized in that: The upper grinding head (1) and the lower grinding head (2) are both replaceable serial products.

4. A special extrusion device for pipe fittings according to claim 1, characterized in that: The inner wall of the lower part of the extrusion channel (15) is provided with an internal thread for connection with a power device. The power device is a pneumatic device, comprising a cylinder (17), an extrusion head (9), a spring (16) and an air pump. The outer wall of the cylinder (17) is provided with an external thread and is connected to the base body (5) via the external thread. The spring (16) is installed in the extrusion channel (15). When the extrusion head (9) is working, it passes through the spring (16) and moves upward.

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