Expansion type spray gun seat welding tool

Abstract

The utility model particularly relates to an expansion type spray gun seat welding tool which comprises an expansion core sleeve and a conical shaft, expansion and contraction of the expansion core sleeve can be controlled by controlling the axial position of the conical shaft relative to the expansion core sleeve, and when a spray gun seat needs to be welded, the expansion core sleeve is arranged in an inner cavity of a welding seat; the conical shaft is driven by the driving structure to move upwards in the axial direction relative to the expansion core sleeve, the expansion core sleeve is expanded outwards on the inner wall of the mounting hole through the first conical surface, and due to the fact that the conical part is of the conical structure with the diameter becoming larger from top to bottom, the first conical surface generates radial and upward force on the expansion core sleeve in the process of expanding the expansion core sleeve outwards. According to the welding device, the welding position of the spray gun seat and the material cylinder is peripherally positioned and downwards positioned, and the upper positioning effect of the first positioning end part on the upper end of the welding seat is combined, so that the operation convenience is ensured, and meanwhile, a good positioning effect is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of welding jigs, and particularly relates to an expansion type spray gun seat welding jig. Background Art

[0002] Welding, also known as fusion welding, is a manufacturing process and technology for joining metals or other thermoplastic materials such as plastics by heating, high temperature or high pressure. During welding, corresponding jigs are required for positioning.

[0003] As Figure 1 shown in the figure, the existing conventional spray gun seat welding jig includes an upper jig plate 1' located outside the spray gun seat a and a lower jig plate 2' located inside the spray gun seat a. The upper jig plate 1' and the lower jig plate 2' are arranged in parallel and are fixedly connected by a screw 3' passing through the two and a nut 4' cooperating with the screw 3'. Both the upper jig plate 1' and the lower jig plate 2' have a rabbet structure, so as to form axial and radial limiting effects on the spray gun seat a, ensuring that the spray gun seat a and the material cylinder b are welded with relatively fixed positions.

[0004] When assembling the above positioning jig, workers need to enter the inside of the material cylinder b. After installing the lower jig plate 2', it is necessary to spot weld the connection position between the lower jig plate 2' and the screw 3' to ensure the stability of the connection. However, after processing, the lower jig plate 2' is difficult to remove due to shrinkage during welding. Content of the Utility Model

[0005] The purpose of the utility model is to overcome the defects and deficiencies existing in the prior art, and provide an expansion type spray gun seat welding jig.

[0006] The technical solution adopted by the utility model is as follows: an expansion type spray gun seat welding jig, including an expansion core sleeve and a taper shaft. The expansion core sleeve is axially limited in the inner cavity of the welding seat a, and the upper end has a first positioning end that forms an abutting fit with the upper end face of the welding seat a. An installation hole is axially provided in the center of the expansion core sleeve. The taper shaft has a tapered portion with a diameter increasing from top to bottom. The outer peripheral surface of the tapered portion forms a first conical surface. One end of the tapered portion penetrates into the installation hole.

[0007] One end of the taper shaft is connected with a driving structure for driving its axial movement. When the taper shaft axially moves relative to the expansion core sleeve, there are a first expansion position where the first conical surface expands the expansion core sleeve outward and tightens it on the inner wall of the installation hole, and a first contraction position where the first conical surface does not cause extrusion deformation with the inner circumference of the installation hole.

[0008] Preferably, the inner wall of the installation hole has a second conical surface that is adapted to the shape of the first conical surface and forms a fit.

[0009] Preferably, the mounting hole axially penetrates through the expansion core sleeve. The taper shaft further includes a threaded shaft portion connected to the upper end of the tapered portion and passing through the mounting hole. The driving structure includes a locking nut threadedly connected to the threaded shaft portion and having its lower end abutted against the upper end of the expansion core sleeve.

[0010] Preferably, the mounting hole includes, from top to bottom, a first straight hole for the threaded shaft portion to pass through and a second tapered hole that forms a fit with the tapered portion. The first straight hole communicates with the second tapered hole. The diameter of the lower end of the first straight hole is smaller than the diameter of the upper end of the second tapered hole, and a first limiting step for fitting with the upper end of the tapered portion is formed therebetween.

[0011] Preferably, the expansion core sleeve includes a plurality of expansion monomers. The plurality of expansion monomers are arranged in a ring and form a mounting hole on their inner circumference. The upper ends of the respective expansion monomers are connected by fixing members.

[0012] Preferably, a clamping groove is provided on the outer circumference of the upper end of the expansion monomer. The clamping grooves on the plurality of expansion monomers combine to form an annular groove. The fixing member is a snap ring that forms a fit with the annular groove, and the fixing member is axially limited within the annular groove.

[0013] Preferably, the upper end of the expansion monomer has a weight-reducing groove, and a clamping groove extends on the inner circumference of the bottom of the weight-reducing groove.

[0014] The beneficial effects of the present utility model are as follows: By controlling the axial position of the taper shaft relative to the expansion core sleeve, the expansion and contraction of the expansion core sleeve can be controlled. When it is necessary to weld the spray gun seat, the expansion core sleeve is inserted into the inner cavity of the welding seat. The driving structure drives the taper shaft to move axially upward relative to the expansion core sleeve. The first conical surface expands the expansion core sleeve outward and tightly presses it against the inner wall of the mounting hole. Since the tapered portion is a tapered structure with a diameter increasing from top to bottom, during the process of the first conical surface expanding the expansion core sleeve outward, radial and upward forces are generated on it, and circumferential positioning and downward positioning effects are formed on the welding positions of the spray gun seat and the material cylinder. Combining with the upper positioning effect of the first positioning end on the upper end of the welding seat, a good positioning effect is achieved while ensuring the convenience of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, obtaining other drawings based on these drawings still belongs to the scope of the present utility model.

[0016] Figure 1 It is a front view cross-sectional view of a conventional spray gun seat welding tooling.

[0017] Figure 2This is a front elevation cross-sectional view of an embodiment of the present utility model;

[0018] Figure 3 This is a top view of an embodiment of the present utility model;

[0019] Figure 4 is Figure 2 an enlarged view of the structure at position A in

[0020] Figure 5 is Figure 2 an enlarged view of the structure at position B in

[0021] In the figure, a is a welding seat; b is a material cylinder; 1 is an expansion core sleeve; 2 is a tapered shaft; 3 is a locking nut; 4 is an expansion monomer; 5 is a fixing member; 11 is a mounting hole; 21 is a tapered portion; 22 is a threaded shaft portion; 41 is a card slot; 42 is a weight reduction groove; 111 is a second tapered surface; 112 is a first straight hole; 113 is a second tapered hole; 114 is a first limiting step; 211 is a first tapered surface. Specific embodiments

[0022] To make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0023] It should be noted that all expressions using "first" and "second" in the embodiments of the present utility model are for distinguishing two entities or parameters with the same name but different, so "first" and "second" are only for the convenience of expression and should not be construed as a limitation on the embodiments of the present utility model. This will not be repeated in subsequent embodiments.

[0024] The direction and position terms mentioned in the present utility model, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "top", "bottom", "side", etc., are only with reference to the direction or position of the accompanying drawings. Therefore, the direction and position terms used are for explaining and understanding the present utility model, rather than a limitation on the protection scope of the present utility model.

[0025] As Figures 2 to 5 shown, in an embodiment of the present utility model, an expansion type spray gun seat welding tooling includes an expansion core sleeve 1 and a tapered shaft 2. The expansion core sleeve 1 is axially limited in the inner cavity of the welding seat a and has a first positioning end portion 12 at the upper end that forms an abutting fit with the upper end surface of the welding seat a. An installation hole 11 is axially provided in the center of the expansion core sleeve 1. The tapered shaft 2 has a tapered portion 21 with a diameter that becomes larger from top to bottom. The outer peripheral surface of the tapered portion 21 forms a first tapered surface 211. One end of the tapered portion 21 penetrates into the installation hole 11.

[0026] One end of the tapered shaft 2 is connected with a driving structure for driving its axial movement. When the tapered shaft 2 axially moves relative to the expansion core sleeve 1, there are a first expansion position where the first conical surface 211 expands the expansion core sleeve 1 outward and tightly presses it against the inner wall of the mounting hole 11, and a first contraction position where the first conical surface 211 does not produce extrusion deformation with the inner circumference of the mounting hole 11.

[0027] With this setting, by controlling the axial position of the tapered shaft relative to the expansion core sleeve, the expansion and contraction of the expansion core sleeve can be controlled. When welding the spray gun seat, the expansion core sleeve is inserted into the inner cavity of the welding seat. The driving structure drives the tapered shaft to move axially upward relative to the expansion core sleeve. The first conical surface expands the expansion core sleeve outward and tightly presses it against the inner wall of the mounting hole. Since the tapered part is a conical structure with a diameter increasing from top to bottom, when the first conical surface expands the expansion core sleeve outward, a radial and upward force is generated on it, and a circumferential positioning and downward positioning effect is formed on the welding position of the spray gun seat and the material cylinder. Combined with the upper positioning effect of the first positioning end on the upper end of the welding seat, a good positioning effect is achieved while ensuring the operation convenience.

[0028] The inner wall of the mounting hole 11 has a second conical surface 111 that is adapted to the shape of the first conical surface 211 and forms a fit.

[0029] With this setting, during the process of the first conical surface extruding the expansion core sleeve to expand it outward and tightly press it against the inner wall of the mounting hole, the second conical surface forms a guiding effect on it, making the fit between the two more stable; at the same time, the fit between the two makes the pressure conduction more stable and the tightening effect better. In this embodiment, the second conical surface is preferably a conical surface with the same shape as the first conical surface.

[0030] The mounting hole 11 axially penetrates the expansion core sleeve 1. The tapered shaft 2 further includes a threaded shaft portion 22 connected to the upper end of the tapered portion 21 and passing through the mounting hole 11. The driving structure includes a locking nut 3 that is threadedly connected to the threaded shaft portion 22 and whose lower end abuts against the upper end of the expansion core sleeve 1.

[0031] With this setting, not only is the structure simple and the operation is simple and effective, but also the contraction and expansion of the expansion core sleeve can be quickly controlled. When welding is required, the expansion core sleeve is installed. When rotating the locking nut in the direction of the screw thread spiraling downward, since the expansion core sleeve restricts the downward movement of the locking nut, the tapered shaft will move upward relative to the expansion core sleeve under the action of the screw thread meshing force, promoting the expansion of the expansion core sleeve; after welding is completed, rotate the locking nut in the direction of the screw thread spiraling upward. Since the expansion of the expansion core sleeve restricts its upward movement, the tapered shaft will move downward relative to the expansion core sleeve under the action of the screw thread meshing force, and the expansion core sleeve gradually contracts. When it contracts to a certain extent, the expansion core sleeve can be taken out.

[0032] The mounting hole 11 includes a first straight hole 112 for the threaded shaft portion 22 to pass through from top to bottom and a second tapered hole 113 that mates with the tapered portion 21. The first straight hole 112 communicates with the second tapered hole 113. The diameter of the lower end of the first straight hole 112 is smaller than the diameter of the upper end of the second tapered hole 113, and a first limiting step 114 that mates with the upper end of the tapered portion 21 is formed therebetween.

[0033] With this arrangement, the first limiting step can prevent the tapered shaft from moving axially too much beyond the shrinkage and expansion limit of the expansion core sleeve, thus avoiding the problem that the expansion core sleeve cannot be removed.

[0034] The expansion core sleeve 1 includes a plurality of expansion monomers 4. The plurality of expansion monomers 4 are arranged in a ring and form a mounting hole 11 on their inner circumference. The upper ends of the expansion monomers 4 are connected by fixing members 5.

[0035] With this arrangement, the split expansion monomers have good expansion effects, are convenient for expansion and contraction, and the fixing members keep the separated expansion monomers as a whole, ensuring the convenience of storage and installation.

[0036] A clamping groove 41 is provided on the outer circumference of the upper end of the expansion monomer 4. The clamping grooves 41 on the plurality of expansion monomers 4 combine to form an annular groove. The fixing member 5 is a snap ring that mates with the annular groove, and the fixing member 5 is axially limited within the annular groove.

[0037] With this arrangement, the snap ring structure keeps the expansion monomers as a whole and has stable connection.

[0038] The upper end of the expansion monomer 4 has a weight-reducing groove 42, and a clamping groove 41 extends from the inner circumference of the bottom of the weight-reducing groove 42.

[0039] With this arrangement, the structure of the expansion monomer is further streamlined.

[0040] The foregoing disclosure is only for the preferred embodiments of the present invention, and of course cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. An expansion type spray gun seat welding tool, characterized in that: The invention comprises an expansion core sleeve (1) and a tapered shaft (2), wherein the expansion core sleeve (1) is axially limited in the inner cavity of a welding seat (a) and has a first positioning end portion (12) at its upper end that is abutted against the upper end surface of the welding seat (a), a mounting hole (11) is arranged axially in the center of the expansion core sleeve (1), and the tapered shaft (2) has a tapered portion (21) whose diameter increases from top to bottom, the outer peripheral surface of the tapered portion (21) forms a first tapered surface (211), and one end of the tapered portion (21) is inserted into the mounting hole (11). One end of the tapered shaft (2) is connected to a driving structure for driving the tapered shaft (2) to move axially. The tapered shaft (2) moves axially relative to the expansion core sleeve (1) and has a first expansion position in which a first tapered surface (211) expands the expansion core sleeve (1) outwardly onto the inner wall of the mounting hole (11) and a first contraction position in which no extrusion deformation occurs between the first tapered surface (211) and the inner periphery of the mounting hole (11).

2. The expansion type spray gun holder welding tool according to claim 1, characterized in that: The inner wall of the mounting hole (11) has a second conical surface (111) that is adapted in shape to and fits with the first conical surface (211).

3. The expansion type spray gun seat welding tool according to claim 1, characterized in that: The mounting hole (11) axially penetrates the expansion core sleeve (1); the tapered shaft (2) further comprises a threaded shaft portion (22) connected to the upper end of the tapered portion (21) and extending through the mounting hole (11); the driving structure comprises a locking nut (3) threadedly connected to the threaded shaft portion (22) and with its lower end abutting against the upper end of the expansion core sleeve (1).

4. The expansion type spray gun seat welding tool according to claim 3, characterized in that: The mounting hole (11) comprises, from top to bottom, a first straight hole (112) for the threaded shaft portion (22) to pass through and a second tapered hole (113) to cooperate with the tapered portion (21); the first straight hole (112) is connected to the second tapered hole (113); the diameter of the lower end of the first straight hole (112) is smaller than the diameter of the upper end of the second tapered hole (113); and a first limiting step (114) to cooperate with the upper end of the tapered portion (21) is formed between the two.

5. The expansion type spray gun seat welding tool according to claim 1, characterized in that: The expansion core sleeve (1) comprises a plurality of expansion units (4), the plurality of expansion units (4) are arranged in a ring shape and have mounting holes (11) formed on their inner circumferences, and the upper ends of the expansion units (4) are connected via fixing members (5).

6. The expansion type spray gun holder welding tool according to claim 5, characterized in that: The outer periphery of the upper end of the expansion unit (4) is provided with a clamping groove (41), and the clamping grooves (41) on a plurality of expansion units (4) are combined to form an annular groove. The fixing member (5) is a clamping spring that cooperates with the annular groove, and the fixing member (5) is axially limited in the annular groove.

7. The expansion type spray gun seat welding tool according to claim 5, characterized in that: The upper end of the expansion unit (4) is provided with a weight-reducing groove (42), and the inner periphery of the bottom of the weight-reducing groove (42) is provided with a clamping groove (41).

Images