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CN-122007262-A - Self-adaptive synchronous clamping pipe expanding equipment for thin-wall pipe

CN122007262ACN 122007262 ACN122007262 ACN 122007262ACN-122007262-A

Abstract

The invention relates to the technical field of pipe expansion and discloses self-adaptive synchronous clamping pipe expansion equipment for thin-walled pipes, which comprises a workbench, wherein a placement plate and a feeding plate are arranged in the workbench, the placement plate is fixedly arranged in the workbench, the feeding plate is movably arranged in the workbench, a limiting structure is arranged on the placement plate, at least two expansion assemblies and a power assembly are arranged on the feeding plate, the power assembly is connected with the expansion assemblies, and the problem that a thin-walled pipe workpiece is easy to deform is effectively solved through the matched use of an outer clamping ring, an inner clamping ring, an outer abutting ring and an inner abutting ring in the expansion assemblies. Specifically, clamping forces are applied simultaneously from the outer wall and the inner wall of the copper pipe through the outer clamping ring and the inner clamping ring respectively, so that the clamping forces are uniformly distributed on the circumferential surface of the copper pipe, and the clamping forces of the inner wall and the outer wall cancel each other, namely, the workpiece is clamped, and the workpiece is prevented from being clamped and deformed.

Inventors

  • SHOU TIEFENG
  • GUO SHENGLI

Assignees

  • 浙江澳森机械有限公司

Dates

Publication Date
20260512
Application Date
20260210

Claims (10)

  1. 1. The self-adaptive synchronous clamping and expanding device for the thin-walled pipe comprises a workbench (10), wherein a placement plate (20) and a feeding plate (30) are arranged in the workbench (10), the placement plate (20) is fixedly arranged in the workbench (10), and the feeding plate (30) is movably arranged in the workbench (10), and the self-adaptive synchronous clamping and expanding device is characterized in that a limiting structure is arranged on the placement plate (20), at least two expansion assemblies and a power assembly are arranged on the feeding plate (30), and the power assembly is connected with the expansion assemblies; The expansion assembly comprises an expansion shell (40), an expansion inner shaft (41), a pushing outer cylinder (42), a pushing inclined shaft (43) and an expansion head (44), wherein the expansion inner shaft (41) is located at the center of the expansion shell (40), the expansion inner shaft (41) is fixedly connected with the expansion shell (40) through a connecting sliding block (412), outer clamping rings (401) and inner clamping rings (411) are respectively fixed at the tail ends of the expansion shell (40) and the expansion inner shaft (41), the pushing inclined shaft (43) is sleeved on the expansion inner shaft (41), the pushing outer cylinder (42) is located at the inner wall of the expansion shell (40), an outer abutting ring (421) and an inner abutting ring (431) are respectively arranged in the expansion inner shaft (41) in a sliding mode, the inner abutting ring (431) is matched with the inner clamping ring (411), and the outer abutting ring (421) is matched with the outer clamping ring (401) to provide an inner clamping effect and an outer clamping effect of a thin pipe.
  2. 2. The self-adaptive synchronous clamping tube expanding equipment for the thin-walled tube according to claim 1, wherein a connecting sliding block (412) on an inner shaft (41) of the tube is penetrated out of the tube expanding shell (40), fixedly arranged on the feeding plate (30) and moves along with the feeding plate (30), the inner wall of the tube expanding shell (40) is fixedly connected to the tube expanding head (44) through at least two connecting rods, and a penetrating outer cylinder sliding groove (423) is formed in the pushing outer cylinder (42).
  3. 3. The self-adaptive synchronous clamping tube expanding equipment for the thin-walled tube according to claim 2, wherein the connecting rod on the tube expanding head (44) slides in the outer cylinder sliding groove (423), a plurality of tube expanding blocks are arranged in the tube expanding head (44), the tube expanding blocks are circumferentially and uniformly distributed, and the tube expanding blocks slide in the tube expanding head (44).
  4. 4. The self-adaptive synchronous clamping tube expanding equipment for thin-walled tubes according to claim 1, wherein the pushing outer cylinder (42) is located on the outer peripheral side of the pushing inclined shaft (43) and is in sliding connection with the inner wall of the tube expanding shell (40), the pushing inclined shaft (43) is slidably mounted on the tube expanding inner shaft (41), and the pushing outer cylinder (42) and the pushing inclined shaft (43) are fixedly mounted on the pushing rod (32) and synchronously move along with the pushing rod (32).
  5. 5. The self-adaptive synchronous clamping and expanding device for the thin-walled pipe according to claim 1 or 4, wherein the side wall of the outer abutting ring (421) is fixedly arranged on the inner wall of the pushing outer cylinder (42) through an outer abutting spring (422), and the outer abutting ring (421) is obliquely arranged inwards near one end face of the outer clamping ring (401) to press the outer clamping ring (401) to expand inwards; The side wall of the inner abutting ring (431) is fixedly arranged on the inner wall of the pushing inclined shaft (43) through an inner abutting spring (432), the inner abutting ring (431) is arranged in an outward inclined mode close to one side end face of the inner clamping ring (411), and the inner clamping ring (411) is extruded to expand outwards.
  6. 6. The self-adaptive synchronous clamping and expanding device for thin-walled pipes according to claim 1, wherein the power assembly comprises a hydraulic cylinder (31) fixed on a feeding plate (30), and further comprises pushing rods (32) mounted on telescopic rods of the hydraulic cylinder (31), at least two pushing rods (32) are arranged, and one ends of the pushing rods (32) are fixed on the expansion assembly corresponding to the expansion assembly.
  7. 7. The self-adaptive synchronous clamping and expanding device for thin-walled pipes as claimed in claim 6, wherein a notch is formed in the pushing rod (32), and the notch corresponds to the connecting sliding block (412) so that the notch and the connecting sliding block (412) can slide relatively.
  8. 8. The self-adaptive synchronous clamping and expanding device for thin-walled pipes according to claim 1, wherein the placement plate (20) is fixed at the bottom of the workbench (10) and corresponds to the feeding plate (30), the placement plate (20) is provided with a placement groove, and at least two limiting pins (21) are arranged in the groove and used for placing a processed workpiece.
  9. 9. The self-adaptive synchronous clamping pipe expanding equipment for the thin-walled pipe is characterized in that a sliding rail groove is further formed in the workbench (10), a feed screw block (301) is fixed at the bottom of the feed plate (30), the feed screw block (301) slides in the sliding rail groove, a feed screw (11) is further rotatably installed in the workbench (10), the feed screw (11) penetrates through the feed screw block (301) and is in threaded fit with the feed screw block (301), and the other end of the feed screw (11) extends to the outside.
  10. 10. The self-adaptive synchronous clamping and expanding device for thin-walled pipes according to claim 9, wherein one side of the hydraulic cylinder (31) is connected with an external oil tank through a hose, an external part of the feed screw (11) is provided with a motor, and the hydraulic cylinder (31) and the motor are controlled to feed through a control system.

Description

Self-adaptive synchronous clamping pipe expanding equipment for thin-wall pipe Technical Field The invention relates to the technical field of tube expansion, in particular to self-adaptive synchronous tube clamping and expanding equipment for a thin-wall tube. Background The tube expansion process is a key process in manufacturing and maintaining pressure vessels such as heat exchangers and boilers, and realizes tight mechanical connection and sealing between the tubes and the tube plates by expanding the tube orifices in the tube plate holes. First, in terms of clamping positioning, conventional expander or tooling typically employs a single external clamp or clamp to secure the tubular member. For thin-wall pipes (especially copper thin-wall pipes), the unidirectional external clamping is extremely easy to cause uneven stress of the pipe wall in the radial direction, and local concave, ovalization and even irreversible plastic deformation are generated. The pre-deformation caused by clamping not only affects the appearance quality of the product, but also damages the uniformity of materials, and can cause stress concentration, uneven expansion joint or sealing failure during subsequent pipe expansion, thereby seriously reducing the reliability of connection and the service life of the product. Secondly, in terms of process flow and efficiency, it is common practice to first firmly clamp the workpiece by an external clamp (possibly a separate vice, chuck or special tooling) and then start the expander for expansion. On the one hand, extra operation links and equipment configuration are added, so that the production rhythm is slow to drag, the working efficiency is low, and on the other hand, an operator is required to carry out twice adjustment and positioning, so that the labor intensity is increased, and accumulated errors can be introduced due to repeated positioning, so that the uniformity of the pipe expanding precision is affected. Disclosure of Invention In order to solve the problems in the prior art, the invention provides self-adaptive synchronous clamping expansion equipment for a thin-walled pipe, which has the advantages of flexible clamping and quick clamping. In order to achieve the aim, the invention provides the following technical scheme that the device comprises a workbench, wherein a placement plate and a feeding plate are arranged in the workbench, the placement plate is fixedly arranged in the workbench, the feeding plate is movably arranged in the workbench, a limiting structure is arranged on the placement plate, at least two expansion assemblies and a power assembly are arranged on the feeding plate, and the power assembly is connected with the expansion assemblies; The expansion assembly comprises an expansion tube shell, an expansion tube inner shaft, a pushing outer cylinder, a pushing inclined shaft and an expansion tube head, wherein the expansion tube inner shaft is positioned in the center of the expansion tube shell, the expansion tube shell and the expansion tube inner shaft are fixedly installed together through connecting sliding blocks, outer clamping rings and inner clamping rings are respectively fixed at the tail ends of the expansion tube shell and the expansion tube inner shaft, the pushing inclined shaft is sleeved on the expansion tube inner shaft, the pushing outer cylinder is positioned at the inner wall of the expansion tube shell, an outer abutting ring and an inner abutting ring are respectively arranged in the pushing outer cylinder and the inner cylinder in a sliding mode, the inner abutting ring is matched with the inner clamping ring, and the outer abutting ring is matched with the outer clamping ring to provide an inner clamping effect and an outer clamping effect of a thin tube. Preferably, the connecting sliding block on the inner shaft of the expansion tube extends to the outside of the expansion tube shell, is fixedly arranged on the feeding plate through the fixing plate and moves along with the feeding plate, the inner wall of the expansion tube shell is fixedly connected to the expansion tube head through at least two connecting rods, and the pushing outer tube is provided with a penetrating outer tube sliding groove. Preferably, the connecting rod on the tube expansion head slides in the outer cylinder sliding groove, a plurality of tube expansion blocks are arranged in the tube expansion head, the tube expansion blocks are circumferentially and uniformly distributed, and the tube expansion blocks slide in the tube expansion head. Preferably, the pushing outer cylinder is located at the outer peripheral side of the pushing inclined shaft and is in sliding connection with the inner wall of the expansion tube shell, the pushing inclined shaft is slidably mounted on the inner shaft of the expansion tube, and the pushing outer cylinder and the pushing inclined shaft are fixedly mounted on the pushing rod and synchronously move along with the pushin