Expansion shaft for welding and positioning head and tail frame flanges

Abstract

The utility model provides a head and tail frame flange welding positioning expansion shaft which comprises a mandrel, an expansion sleeve, a push ring and a locking device. The locking devices are arranged at the two ends of the central spindle and can move towards the middle of the central spindle, the expansion sleeve and the push ring are sequentially and alternately arranged on the central spindle between the locking devices in a sleeving mode, and the adjacent ends of the expansion sleeve and the push ring abut against each other through conical surfaces. And the end part of the push ring can be embedded into the expansion sleeve by adjusting the position of the locking device, so that the expansion sleeve expands. By adopting the structure of the expansion sleeves and the push rings which are alternately arranged and the adjustable locking device, the synchronous tensioning and expansion of the expansion sleeves at all parts on the mandrel are effectively realized, so that the headstock, the tailstock and the flange can be accurately and synchronously fixed in the welding process, and the precision and the efficiency of the welding operation are obviously improved.

Description

Technical Field

[0001] The utility model relates to the field of head and tail frame welding, in particular to a head and tail frame flange welding positioning expansion shaft. Background Art

[0002] Chain conveyors are often used in conveyors for conveying objects such as paper mills and logistics conveyor lines, and the number of chain conveyors is often large. When the chain conveyor is long, it is generally divided into head and tail frames and middle frames, such as the high-speed heavy-load chain conveyor disclosed in the prior art CN202122852002.1. At present, the manufacture of the head and tail frames is completed by welding. When assembling, aligning and positioning the head and tail frames, the assembly accuracy and welding deformation between the various components of the head and tail frames are very important for the head and tail frames. In particular, the flanges on both sides of the head and tail frames need to ensure coaxiality during welding, and the required accuracy is relatively high. Therefore, directly using the rod shaft passing through the flange for positioning can easily cause the flange to be offset, resulting in insufficient welding accuracy and affecting use.

[0003] The prior art CN202222985358.7 discloses a head and tail frame positioning tool, comprising: a base, a front positioning plate and a rear positioning plate for fixing the left and right vertical plates of the head and tail frames, and a support for positioning the connection structure, wherein the front positioning plate and the rear positioning plate are arranged parallel to each other on the base; a plurality of support members are arranged horizontally between the front positioning plate and the rear positioning plate, and the support members are arranged parallel to the front positioning plate and the rear positioning plate, and the front positioning plate is stepped on both sides of a side close to the rear positioning plate, and grooves are arranged at intervals on both sides of the rear positioning plate; the utility model adopts a positioning shaft to position the flanges on both sides of the head and tail frames for welding, but the following problems still exist:

[0004] 1. In order to facilitate the positioning shaft to pass through the flanges that need to be welded on both sides of the head and tail frames and the through holes of the head and tail frames, the outer diameter of the positioning shaft is generally slightly smaller than the inner diameter of the flange and the through hole. Therefore, during positioning, the flange will deviate downward under its own weight, and the positioning shaft will also abut against the lower end of the through hole in the through hole, resulting in a large deviation during welding, affecting product quality.

[0005] 2. Existing expansion shafts (such as CN201420833683.4) expand from both ends to the middle, resulting in non-uniform expansion sizes in various parts. When the head and tail frames are used, since the inner diameters of the flanges and the through holes of the head and tail frames are the same, but are located at different positions on the axis, under the influence of the flanges, the through holes closer to the middle of the expansion shaft cannot be expanded and fixed by the expansion shaft, resulting in welding errors and affecting product quality. Utility Model Content

[0006] In view of this, the purpose of the utility model is to provide a head and tail frame flange welding positioning expansion shaft, which effectively realizes the synchronous tensioning and expansion of the expansion sleeves at various parts of the core shaft by adopting alternately arranged expansion sleeves and push ring structures, and an adjustable locking device, thereby ensuring that the head and tail frames and flanges can be accurately and synchronously fixed during the welding process, significantly improving the accuracy and efficiency of the welding operation.

[0007] The technical solution adopted by the utility model to solve its technical problems is:

[0008] Provided is a head and tail frame flange welding positioning expansion shaft, comprising: a core shaft, an expansion sleeve, a push ring, and a locking device;

[0009] The locking devices are arranged at both ends of the core shaft and can move toward the middle of the core shaft. The expansion sleeve and the push ring are alternately sleeved on the core shaft between the locking devices in sequence, and the adjacent ends of the expansion sleeve and the push ring abut against each other through conical surfaces. The position of the locking device can be adjusted to make the end of the push ring embedded in the expansion sleeve to expand the expansion sleeve.

[0010] It should be noted that the locking device is moved axially toward the middle of the core shaft to squeeze the expansion sleeve and the push ring on the core shaft, so that the end of the push ring will gradually embed into the expansion sleeve. Due to the interaction of the conical surfaces, both ends of the expansion shaft can expand synchronously under the pressure of the push ring, thereby realizing rapid and precise expansion positioning of the expansion shaft. The degree of expansion can be controlled by adjusting the locking device, which is easy to operate and improves the efficiency and positioning accuracy of the welding operation.

[0011] Preferably, the locking device includes a locking block, a locking plate and a locking screw, and screw holes are provided at both ends of the core shaft corresponding to the locking screws. The locking block and the locking plate are respectively arranged at the two ends of the core shaft through the cooperation of the locking screws and the screw holes, and the distance between the locking block and the locking plate can be adjusted by rotating the locking screw.

[0012] It should be noted that the locking block and locking plate are fixed by the locking screw and the screw holes at both ends of the core shaft. Rotating the locking screw can change the distance between the locking block and the locking plate, thereby pushing or pulling the expansion sleeve and push ring on the core shaft. The operator can intuitively and conveniently adjust the distance between the locking block and the locking plate, thereby changing the relative position of the expansion sleeve and the push ring, thereby achieving precise control of the expansion shaft and improving operational convenience.

[0013] Preferably, a cross-sectional through groove is provided on the expansion sleeve along the axial direction, and the cross-sectional through groove penetrates the circumferential wall of the expansion sleeve.

[0014] It should be noted that the design of the cross-section through groove enables the material of the expansion sleeve to undergo local deformation at the through groove when the expansion sleeve is squeezed by the push ring, making it easier to achieve uniform and effective radial expansion.

[0015] Preferably, the cross-sectional through grooves are spiral grooves distributed on the circumferential wall of the expansion sleeve in a spiral shape.

[0016] It should be noted that the cross-sectional through grooves are distributed in a spiral shape on the circumferential wall of the expansion sleeve. When the push ring is embedded in the expansion sleeve, the spiral grooves guide the expansion sleeve material to expand evenly along the spiral path, further optimizing the expansion performance of the expansion sleeve, ensuring the balanced distribution of axial pressure during the expansion process, and improving the accuracy and stability of welding positioning. At the same time, the spiral grooves enable the expansion sleeve to expand gradually and evenly along the spiral trajectory when subjected to force, avoiding stress concentration, reducing the impact on the flange surface, and helping to protect the workpiece.

[0017] Preferably, the push ring comprises a tapered ring and a sleeve, and the tapered ring is coaxially arranged on both sides of the sleeve.

[0018] It should be noted that the conical ring design makes the contact between the push ring and the expansion sleeve a conical surface contact, so that a larger radial expansion force can be generated by applying a smaller axial force, thereby improving the driving efficiency. The length of the push ring can be changed by using sleeves of different lengths, so that the number of expansion sleeves can be adjusted according to needs, thereby enhancing the versatility and applicability of the equipment.

[0019] Preferably, the tapered ring and the sleeve are formed integrally.

[0020] It should be noted that the one-piece push ring reduces the connection interface between parts, enhances the overall structural strength and durability of the push ring, and extends the service life of the equipment.

[0021] Preferably, the push ring and the expansion sleeve are made of high-hardness wear-resistant metal.

[0022] It should be noted that the high-hardness wear-resistant metal material improves the wear resistance of the push ring and the expansion sleeve during frequent contact and friction, reduces the wear rate of the equipment, and extends the service life.

[0023] Beneficial effects of the utility model:

[0024] The utility model provides a head and tail frame flange welding positioning expansion shaft, which effectively realizes the synchronous tensioning and expansion of the expansion sleeves at various parts of the core shaft by adopting alternately arranged expansion sleeves and push ring structures, and an adjustable locking device, thereby ensuring that the head and tail frames and flanges can be accurately and synchronously fixed during the welding process, significantly improving the accuracy and efficiency of the welding operation; relying on its advantages such as synchronous tensioning and expansion, precise control, optimized expansion performance, efficient drive, strong adaptability, and excellent structural strength and durability, it significantly improves the accuracy, efficiency and service life of the welding operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1It is a three-dimensional schematic diagram of a head and tail frame flange welding positioning expansion shaft in Example 1 of the utility model.

[0026] Figure 2 This is a cross-sectional view of a head and tail frame flange welding positioning expansion shaft in Example 1 of the utility model.

[0027] Figure 3 It is a three-dimensional schematic diagram of the core shaft of Example 1 of the utility model.

[0028] Figure 4 This is a schematic diagram of the locking plate structure of Example 1 of the utility model.

[0029] Figure 5 This is a schematic diagram of the locking block structure of Example 1 of the utility model.

[0030] Figure 6 This is a schematic diagram of the expansion sleeve structure of Example 1 of the utility model.

[0031] Figure 7 It is a three-dimensional schematic diagram of a head and tail frame flange welding positioning expansion shaft in Example 2 of the utility model.

[0032] Figure 8 This is a schematic diagram of the expansion sleeve structure of Example 2 of the utility model.

[0033] Fig. 9 This is a schematic diagram of the push ring structure of Example 3 of the utility model.

[0034] In the figure: 1, core shaft; 11, screw hole; 2, expansion sleeve; 21, cross-sectional through groove; 22, spiral groove; 3, push ring; 31, tapered ring; 32, sleeve; 4, locking device; 41, locking block; 42, locking plate; 43, locking screw.

[0035] It should be noted that these drawings and text descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0037] Example 1

[0038] like Figure 1-Figure 6As shown, a head and tail frame flange welding positioning expansion shaft comprises: a core shaft 1, an expansion sleeve 2, a push ring 3, and a locking device 4;

[0039] The locking device 4 is arranged at both ends of the core shaft 1 and can move toward the middle of the core shaft 1. The expansion sleeve 2 and the push ring 3 are alternately sleeved on the core shaft 1 between the locking devices 4 in sequence, and the adjacent ends of the expansion sleeve 2 and the push ring 3 are abutted against each other through conical surfaces, and the position of the locking device 4 can be adjusted to make the end of the push ring 3 embedded in the expansion sleeve 2 to expand the expansion sleeve 2.

[0040] The locking device 4 includes a locking block 41, a locking plate 42 and a locking screw 43. Screw holes 11 are provided at both ends of the core shaft 1 corresponding to the locking screws 43. The locking block 41 and the locking plate 42 are respectively arranged at the two ends of the core shaft 1 through the cooperation of the locking screws 43 and the screw holes 11, and the distance between the locking block 41 and the locking plate 42 can be adjusted by rotating the locking screw 43.

[0041] The expansion sleeve 2 is provided with a cross-sectional through groove 21 along the axial direction, and the cross-sectional through groove 21 penetrates the circumferential wall of the expansion sleeve 2 .

[0042] The push ring 3 and the expansion sleeve 2 are made of high-hardness wear-resistant metal.

[0043] The working principle and use method of the head and tail frame flange welding positioning expansion shaft of this embodiment:

[0044] The present embodiment provides an expansion shaft for welding and positioning the head and tail frame flanges. When the head and tail frames and the flanges need to be welded and positioned, the core shaft 1 is first inserted into the welding position between the head and tail frames and the flanges; the expansion sleeves 2 and the push rings 3 alternately sleeved on the core shaft 1 abut against each other through the conical surface; when the locking device 4 moves toward the middle of the core shaft 1, the end of the push ring 3 gradually embeds into the expansion sleeve 2; due to the effect of the conical surface, the axial pressure applied by the push ring 3 to the expansion sleeve 2 is converted into a radial expansion force, so that the two ends of the expansion sleeve 2 expand synchronously and evenly; this synchronous expansion mechanism ensures the synchronous and uniform clamping of the head and tail frames and the flanges, providing a good foundation for subsequent welding operations. The design of the locking device 4 (including the locking block 41, the locking sheet 42 and the locking screw 43) allows the operator to easily adjust the distance between the locking block 41 and the locking sheet 42 by rotating the locking screw 43, thereby accurately controlling the relative position of the expansion sleeve 2 and the push ring 3. The intuitive and convenient operation method improves work efficiency and enhances operational convenience. The cross-sectional through groove 21 opened along the axial direction of the expansion sleeve 2 not only penetrates the circumferential wall, but also provides deformation space for the material. The expansion sleeve 2 achieves uniform and efficient radial expansion through the cross-sectional through groove 21, ensuring stable clamping of the head and tail frames and the flange.

[0045] When in use, insert the mandrel 1 between the head and tail frames to be welded and the flange to ensure that its position is accurate, adjust the position of the flange on the head and tail frames, rotate the locking screw 43, adjust the spacing between the locking block 41 and the locking plate 42, so that the push ring 3 begins to gradually embed into the expansion sleeve 2, pay attention to observation and fine-tune as needed to ensure that the expansion sleeve 2 applies appropriate tension to the head and tail frames and the flange to achieve the ideal positioning effect, check whether the expansion sleeve 2 has been evenly and fully expanded, ensure that the head and tail frames and the flange are firmly and stably clamped without obvious shaking or gaps, and after the expansion shaft achieves accurate and stable positioning of the head and tail frames and the flange, welding can be carried out; during the welding process, regularly check the working state of the expansion shaft to ensure that it continues to provide stable positioning support. After welding, reversely rotate the locking screw 43 to relax the squeezing of the expansion sleeve 2 and the push ring 3 to restore the expansion sleeve 2 to its original state. Then remove the expansion shaft to complete the release of welding positioning.

[0046] Example 2

[0047] like Figure 7 and Figure 8 As shown, a head and tail frame flange welding positioning expansion shaft of this embodiment includes: a core shaft 1, an expansion sleeve 2, a push ring 3, and a locking device 4;

[0048] The locking device 4 is arranged at both ends of the core shaft 1 and can move toward the middle of the core shaft 1. The expansion sleeve 2 and the push ring 3 are alternately sleeved on the core shaft 1 between the locking devices 4 in sequence, and the adjacent ends of the expansion sleeve 2 and the push ring 3 are abutted against each other through conical surfaces, and the position of the locking device 4 can be adjusted to make the end of the push ring 3 embedded in the expansion sleeve 2 to expand the expansion sleeve 2.

[0049] The locking device 4 includes a locking block 41, a locking plate 42 and a locking screw 43. Screw holes 11 are provided at both ends of the core shaft 1 corresponding to the locking screws 43. The locking block 41 and the locking plate 42 are respectively arranged at the two ends of the core shaft 1 through the cooperation of the locking screws 43 and the screw holes 11, and the distance between the locking block 41 and the locking plate 42 can be adjusted by rotating the locking screw 43.

[0050] The expansion sleeve 2 is provided with a cross-sectional through groove 21 along the axial direction, and the cross-sectional through groove 21 penetrates the circumferential wall of the expansion sleeve 2 .

[0051] The cross-sectional through grooves 21 are spirally distributed on the spiral grooves 22 on the circumferential wall of the expansion sleeve 2 .

[0052] The push ring 3 and the expansion sleeve 2 are made of high-hardness wear-resistant metal.

[0053] Compared with Example 1:

[0054] The present embodiment provides a head and tail frame flange welding positioning expansion shaft, which not only penetrates the circumferential wall through a cross-sectional through groove 21 opened along the axial direction on the expansion sleeve 2, but also its shape is further optimized to be a spiral groove 22 distributed in a spiral shape on the circumferential wall of the expansion sleeve 2. The spiral groove 22 guides the material of the expansion sleeve 2 to expand evenly along the spiral path under the pressure of the thrust ring 3, which helps to more effectively disperse the stress, maintain a balanced distribution of axial pressure during the expansion process, and avoid positioning deviation or local loosening caused by uneven pressure, thereby improving the accuracy and stability of welding positioning. Compared with instantaneous full expansion, this method can reduce the impact on the flange surface, which is beneficial to protecting the surface quality of the workpiece, especially when processing precision or fragile parts.

[0055] Embodiment 3

[0056] like Fig. 9 As shown, a head and tail frame flange welding positioning expansion shaft of this embodiment includes: a core shaft 1, an expansion sleeve 2, a push ring 3, and a locking device 4;

[0057] The locking device 4 is arranged at both ends of the core shaft 1 and can move toward the middle of the core shaft 1. The expansion sleeve 2 and the push ring 3 are alternately sleeved on the core shaft 1 between the locking devices 4 in sequence, and the adjacent ends of the expansion sleeve 2 and the push ring 3 are abutted against each other through conical surfaces, and the position of the locking device 4 can be adjusted to make the end of the push ring 3 embedded in the expansion sleeve 2 to expand the expansion sleeve 2.

[0058] The locking device 4 includes a locking block 41, a locking plate 42 and a locking screw 43. Screw holes 11 are provided at both ends of the core shaft 1 corresponding to the locking screws 43. The locking block 41 and the locking plate 42 are respectively arranged at the two ends of the core shaft 1 through the cooperation of the locking screws 43 and the screw holes 11, and the distance between the locking block 41 and the locking plate 42 can be adjusted by rotating the locking screw 43.

[0059] The expansion sleeve 2 is provided with a cross-sectional through groove 21 along the axial direction, and the cross-sectional through groove 21 penetrates the circumferential wall of the expansion sleeve 2 .

[0060] The push ring 3 includes a conical ring 31 and a sleeve 32 , and the conical ring 31 is coaxially arranged on both sides of the sleeve 32 .

[0061] Compared with Example 1:

[0062] The present embodiment adopts a push ring 3 having a combined structure of a tapered ring 31 and a sleeve 32. By replacing the sleeve 32 of different lengths, the overall length of the push ring 3 can be flexibly adjusted, and the expansion sleeve 2 and the push ring 3 can be accurately matched for expansion shafts of different lengths, so that they can expand under the action of the locking device 4. This design enhances the versatility and applicability of the equipment, so that the same expansion shaft can adapt to the welding positioning tasks of expansion sleeves 2 of various specifications or different numbers, thereby reducing the user's equipment purchase cost and improving production flexibility.

[0063] Finally, it should be noted that the above is only a preferred embodiment of the utility model, which is only used to illustrate the technical solution of the utility model, and is not used to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model are included in the protection scope of the utility model.

[0064] In the description of the present invention, it needs to be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "upper end", "lower end", "upper surface", "lower surface", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0065] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "install", "connect", "connection" and "set" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

Claims

1. A head and tail frame flange welding positioning expansion shaft, comprising: A core shaft (1), an expansion sleeve (2), a push ring (3), and a locking device (4); the characteristics are: The locking device (4) is arranged at both ends of the core shaft (1) and can move toward the middle of the core shaft (1); the expansion sleeve (2) and the push ring (3) are alternately sleeved on the core shaft (1) between the locking devices (4) in sequence, and the adjacent ends of the expansion sleeve (2) and the push ring (3) are abutted against each other through conical surfaces, and the end of the push ring (3) can be embedded in the expansion sleeve (2) by adjusting the position of the locking device (4) to expand the expansion sleeve (2).

2. The head and tail frame flange welding positioning expansion shaft according to claim 1, characterized in that: The locking device (4) comprises a locking block (41), a locking sheet (42) and a locking screw (43); screw holes (11) are provided at both ends of the core shaft (1) corresponding to the locking screw (43); the locking block (41) and the locking sheet (42) are respectively arranged at the two ends of the core shaft (1) through the cooperation of the locking screw (43) and the screw hole (11); and the spacing between the locking block (41) and the locking sheet (42) can be adjusted by rotating the locking screw (43).

3. The head and tail frame flange welding positioning expansion shaft according to claim 1, characterized in that: A cross-sectional through groove (21) is provided on the expansion sleeve (2) along the axial centerline direction, and the cross-sectional through groove (21) penetrates the circumferential wall of the expansion sleeve (2).

4. The head and tail frame flange welding positioning expansion shaft according to claim 3, characterized in that: The cross-sectional through groove (21) is a spiral groove (22) distributed in a spiral shape on the circumferential wall of the expansion sleeve (2).

5. The head and tail frame flange welding positioning expansion shaft according to claim 1, characterized in that: The push ring (3) comprises a conical ring (31) and a sleeve (32), wherein the conical ring (31) is coaxially arranged on both sides of the sleeve (32).

6. The head and tail frame flange welding positioning expansion shaft according to claim 5, characterized in that: The conical ring (31) and the sleeve (32) are integrally formed.

7. The head and tail frame flange welding positioning expansion shaft according to claim 1, characterized in that: The push ring (3) and the expansion sleeve (2) are made of high-hardness wear-resistant metal.

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