Sand blasting device for separating metal pipe from drawing core rod

Abstract

The utility model belongs to the technical field of metal pipe processing, and provides a sand blasting device for separating a metal pipe from a drawing core rod, which comprises a sand blasting box, a sand blasting mechanism and a clamping and rotating mechanism, the sand blasting mechanism and the clamping and rotating mechanism are both arranged in the sand blasting box; the clamping and rotating mechanism comprises two clamping and supporting parts and a rotating driving mechanism, and the two clamping and supporting parts are oppositely arranged; the sand blasting mechanism comprises a plurality of sand blasting nozzles; the plurality of sand blasting nozzles are positioned above the clamping and rotating mechanism; a linear driving mechanism for driving the sand blasting nozzle to do linear reciprocating motion is arranged at the top of the inner cavity of the sand blasting box; the multiple sand blasting nozzles are arranged on a power output piece of the linear driving mechanism, and the sand blasting directions of the multiple sand blasting nozzles face downwards. On the premise that the metal pipe and the core rod can be separated, the influence on the surface and the size of the metal pipe is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of metal pipe processing, and particularly relates to a sandblasting device for separating a metal pipe from a drawing core rod. Background Art

[0002] During the manufacturing process, metal pipes are typically drawn using a drawing die and a core rod, resulting in a semi-finished product in which the metal pipe and core rod are tightly attached. This semi-finished product then needs to be loosened, meaning the core rod, which is tightly embedded in the metal pipe, needs to be removed to obtain the hollow finished metal pipe. To separate the metal pipe and core rod, the prior art typically uses a loosening device containing sliding rollers to directly clamp the outer wall of the metal pipe. This then uses external force to drive the metal pipe containing the core rod back and forth axially, ultimately creating a slight gap between the metal pipe and the core rod, allowing the metal pipe and core rod to be separated.

[0003] However, when separating the metal pipe from the core rod, the direct clamping contact between the clamping parts of the loosening device and the outer wall of the metal pipe will cause scratches on the surface of the metal pipe and even cause uncontrollable dimensional deformation of the metal pipe, affecting the quality of the finished metal pipe and restricting the market promotion and application of the metal pipe. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a sandblasting device for separating a metal tube from a drawing core rod, which reduces the impact on the surface and size of the metal tube while achieving the separation of the metal tube from the core rod.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A sandblasting device for separating a metal pipe from a drawing core rod comprises a sandblasting box, a sandblasting mechanism and a clamping and rotating mechanism; the sandblasting mechanism and the clamping and rotating mechanism are both arranged in the sandblasting box; wherein,

[0007] The clamping and rotating mechanism includes two clamping support components for clamping the ends of the core rod and a rotation driving mechanism for driving the two clamping support components to rotate along the circumference of the core rod, and the two clamping support components are arranged opposite to each other;

[0008] The sandblasting mechanism includes several sandblasting nozzles, and several of the sandblasting nozzles are located above the clamping and rotating mechanism; a linear drive mechanism for driving the sandblasting nozzles to move back and forth linearly is provided at the top of the inner cavity of the sandblasting box; several of the sandblasting nozzles are arranged on the power output part of the linear drive mechanism, and the sandblasting direction of several of the sandblasting nozzles is downward.

[0009] The working principle of the above-mentioned sandblasting device for separating the metal pipe from the drawing core rod is:

[0010] The metal tube and core rod to be separated are mounted on a clamping and rotating mechanism. Because the core rod is longer than the metal tube and its ends extend beyond the tube, this feature allows two clamping support components to clamp each end of the core rod. Next, the sandblasting mechanism operates, with the sandblasting nozzle spraying high-speed abrasive media onto the surface of the metal tube. The rotary drive mechanism and the linear drive mechanism operate synchronously. The rotary drive mechanism rotates the two clamping support components 360°, while the linear drive mechanism drives the sandblasting nozzle to move linearly along the axis of the core rod, ensuring that the high-speed abrasive media is evenly applied to the outer surface of the metal tube. As the high-speed abrasive media impacts the outer surface of the metal tube, it generates a uniform and subtle cutting force or mechanical stress, creating a certain gap between the metal tube and the core rod. Finally, the sandblasting mechanism and the clamping and rotating mechanism are deactivated, and the ends of the core rod are released by the clamping support components. The metal tube and core rod can then be separated by removal.

[0011] In a preferred embodiment of the present invention, the clamping support component includes a support frame and a clamping assembly arranged on the support frame, the clamping assembly includes a base and at least three clamping jaws, each of the clamping jaws is evenly distributed on the base and can be moved in a radial direction close to or away from the center of the base to achieve clamping or loosening of the core rod end.

[0012] Preferably, the clamping assembly further includes a rotating shaft; the base is fixedly connected to one end of the rotating shaft, and the rotating shaft is rotatably connected to the support frame.

[0013] Preferably, the rotary drive mechanism includes a first power source and a first synchronous belt transmission assembly, the first synchronous belt transmission assembly includes a first driving wheel, a first driven wheel and a first synchronous belt; the first driving wheel is connected to the power output member of the first power source, the first driven wheel is connected to the end of the rotating axis of one of the clamping support components away from the base, and the first synchronous belt is wrapped around the first driving wheel and the first driven wheel.

[0014] In a preferred embodiment of the present invention, the linear drive mechanism includes a movable frame and a second power source; the movable frame is slidably arranged on the top of the sandblasting box, and driven by the second power source, the movable frame drives the plurality of sandblasting nozzles to reciprocate along the axis of the core rod.

[0015] Preferably, the linear drive mechanism also includes a second synchronous belt transmission assembly, the second synchronous belt transmission assembly includes a second driving wheel, a second driven wheel and a second synchronous belt, the second driving wheel and the second driven wheel are both rotatably arranged on the top of the inner cavity of the sandblasting box, and the power output of the second power source is connected to the second driving wheel, and the second synchronous belt is arranged around the second driving wheel and the second driven wheel; the movable frame is connected to one side of the second synchronous belt.

[0016] Preferably, the movable frame includes two supporting members and an intermediate connecting member, the two supporting members are arranged opposite to each other and are slidably connected to the top of the inner cavity of the sandblasting box, the intermediate connecting member is connected between the two supporting members, and the plurality of sandblasting nozzles are arranged on the intermediate connecting member;

[0017] The second synchronous belt transmission assembly is located between the two support members.

[0018] Preferably, a guide assembly is provided between the two support members and the top of the inner cavity of the sandblasting box; the guide assembly includes a guide rail and a slider, the guide rail is fixedly connected to the sandblasting box, and the slider is fixedly connected to the support member.

[0019] A preferred solution of the present invention further comprises an air knife, which is arranged on the inner wall of the sandblasting box, and the air outlet direction of the air knife acts on the metal pipe, and the air knife is connected to the fan.

[0020] A preferred embodiment of the present invention further comprises a sand material circulation system; the sand material circulation system comprises a sand receiving trough, a sand storage trough and a sand material conveying pipeline;

[0021] A partition is provided in the sandblasting box, the sand receiving trough is provided in the middle of the partition, the sand receiving trough is in an inverted cone shape, and the two clamping support components are provided on the partition and located on both sides of the sand receiving trough;

[0022] The sand storage tank is arranged below the partition and is communicated with the sand receiving tank; the sand storage tank is connected to the sand blasting mechanism through the sand material conveying pipeline to supply sand material medium to the sand blasting mechanism.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] This utility model innovatively uses high-speed sandblasting to separate the metal tube and the core rod, which helps reduce the impact on the surface quality of the metal tube, thereby improving the quality of the finished metal tube. Specifically, during processing, the high-speed sandblasting uses cutting force and impact force on the outer wall of the metal tube, causing the metal tube wall to rebound slightly radially outward, creating a small gap between the inner wall of the tube and the core rod, thereby separating the two. The sandblasting process can effectively improve the surface quality of the metal tube. Only the two ends of the core rod are clamped, which can effectively avoid damage to the metal tube surface and improve the quality of the finished metal tube.

[0025] Furthermore, when sandblasting the metal pipe, the sandblasting nozzle can move back and forth in a straight line, and at the same time cooperate with the rotation of the metal pipe and the core rod, so that the sand material ejected at high speed can act evenly on the surface of the metal pipe, making the impact force acting on the outer wall of the metal pipe more balanced, which is conducive to improving the uniformity of the gap between the metal pipe and the core rod, making it easier to separate the metal pipe, and better protecting the surface quality of the metal pipe to avoid deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 This is a front view of the sandblasting device of the present invention for separating a metal pipe from a drawing core rod.

[0028] Figure 2 for Figure 1 Schematic diagram of the hidden sandblasting box and sandblasting mechanism.

[0029] Figure 3 It is a three-dimensional diagram of the sandblasting device of the present invention for separating a metal pipe from a drawing core rod.

[0030] Figure 4 This is a three-dimensional diagram of the clamping and rotating mechanism of the sandblasting device for separating a metal pipe from a drawing core rod according to the present invention.

[0031] Figure 5 This is a three-dimensional diagram of the linear drive mechanism and sandblasting nozzle of the sandblasting device for separating a metal pipe from a drawing core rod according to the present invention.

[0032] Figure 6 Schematic diagram of metal pipe and core rod.

[0033] in:

[0034] A-metal pipe, B-core rod;

[0035] 1-Sandblasting box, 2-Sandblasting nozzle, 3-Air knife, 4-Control unit, 5-Clamping support component, 6-Sand receiving trough, 7-Sand storage trough, 8-Sand material conveying pipeline, 9-Sandblasting mechanism, 10-Partition, 11-Moving frame, 12-First power source, 13-First driving wheel, 14-First driven wheel, 15-Second power source, 16-Second synchronous belt, 17-Support frame, 18-Base, 19-Clamping claw, 20-Rotating shaft, 21-Second driving wheel, 22-Second driven wheel, 23-Guide rail, 24-Slider, 25-Support, 26-Connecting plate, 27-Vertical plate, 28-Clamping block. DETAILED DESCRIPTION

[0036] In order to more clearly understand the above-mentioned purposes, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of this application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0038] Example 1

[0039] See also Figures 1-6 This embodiment discloses a sandblasting device for separating a metal pipe from a drawing core rod, including a sandblasting box 1, a sandblasting mechanism 9, a clamping and rotating mechanism, an air knife 3 and a control unit 4; the sandblasting mechanism 9 and the clamping and rotating mechanism are both arranged in the sandblasting box 1.

[0040] The clamping and rotating mechanism includes two clamping support components 5 for clamping the ends of the core rod B and a rotation driving mechanism for driving the two clamping support components 5 to rotate along the circumferential direction of the core rod B. The two clamping support components 5 are arranged opposite to each other.

[0041] The sandblasting mechanism 9 includes several sandblasting nozzles 2, and the several sandblasting nozzles 2 are located above the clamping rotating mechanism; a linear drive mechanism for driving the sandblasting nozzles 2 to move back and forth in a straight line is provided at the top of the inner cavity of the sandblasting box 1; the several sandblasting nozzles 2 are arranged on the power output part of the linear drive mechanism, and the sandblasting direction of the several sandblasting nozzles 2 is downward.

[0042] The specific implementation of the control unit 4 can be found in the prior art. It generally includes a processor, a control panel, a signal transceiver, a touch / non-touch display, buttons / knobs, and other electronic components. Its function is to control the start and stop of the device, precisely adjust parameters, and monitor operating parameters. For example, the control unit 4 can control the sandblasting volume and speed of the sandblasting nozzle 2, the rotation speed of the clamping rotation mechanism, the speed at which the linear drive mechanism drives the sandblasting nozzle 2 to move linearly back and forth, and the air volume and speed of the air knife 3.

[0043] See also Figure 1-Figure 4 The clamping support component 5 includes a support frame 17 and a clamping assembly arranged on the support frame 17. The clamping assembly includes a base 18 and at least three clamping jaws 19. Each clamping jaw 19 is evenly distributed on the base 18 and can move in the radial direction close to or away from the center of the base 18 to achieve clamping or loosening of the end of the core rod B. In this embodiment, the clamping assembly can refer to the three-jaw pneumatic clamp of the prior art, and the cylinder is used to control the loosening or clamping of the three clamping jaws 19 to improve the convenience of fixing the end of the core rod B. In addition, manual clamping can also be used for fixing, for example, Figure 4 In the figure, the clamping jaws 19 can be locked in position by means of screws or manual knobs. The screws or manual knobs are not shown in the figure. For details, please refer to the prior art.

[0044] join Figure 3-Figure 4 The clamping assembly further includes a rotating shaft 20; the base 18 is fixedly connected to one end of the rotating shaft 20, and the rotating shaft 20 is rotatably connected to the support frame 17. Specifically, the rotating shaft 20 and the support frame 17 in this embodiment can be connected by a bearing to achieve the rotation of the clamping assembly and the core rod B during operation.

[0045] See also Figure 3-Figure 4The rotary drive mechanism includes a first power source 12 and a first synchronous belt transmission assembly. The first synchronous belt transmission assembly includes a first driving wheel 13, a first driven wheel 14 and a first synchronous belt (not shown in the figure); the first driving wheel 13 is connected to the power output member of the first power source 12, and the first driven wheel 14 is connected to the end of the rotating shaft 20 of one of the clamping support components 5 away from the base 18. The first synchronous belt is wrapped around the first driving wheel 13 and the first driven wheel 14. Specifically, the first power source 12 of this embodiment adopts a motor, and the main shaft of the motor is connected to the first driving wheel 13. The rotation drive of the clamping assembly is realized through the first synchronous belt transmission assembly and the first power source 12. The structure is simple and easy to assemble. In addition, the rotary drive mechanism of this embodiment drives the clamping assembly of one of the clamping support components 5 to rotate, and then synchronously drives the clamping assembly of the other clamping support component 5 to rotate synchronously through the core rod B.

[0046] See also Figure 2 and Figure 5 The linear drive mechanism includes a movable frame 11 and a second power source 15; the movable frame 11 can be slidably arranged on the top of the sandblasting box 1, and driven by the second power source 15, the movable frame 11 drives several sandblasting nozzles 2 to move back and forth along the axial direction of the core rod B.

[0047] See also Figure 3 and Figure 5 The linear drive mechanism also includes a second synchronous belt transmission assembly, which includes a second driving wheel 21, a second driven wheel 22 and a second synchronous belt 16. The second driving wheel 21 and the second driven wheel 22 are both rotatably arranged at the top of the inner cavity of the sandblasting box 1, and the power output member of the second power source 15 is connected to the second driving wheel 21. The second synchronous belt 16 is arranged around the second driving wheel 21 and the second driven wheel 22; the movable frame 11 is connected to one side of the second synchronous belt 16. The use of synchronous belt transmission has a simple structure and is also convenient for realizing the linear reciprocating movement of the movable frame 11 and the sandblasting nozzle 2. In addition, the transmission assembly of the linear drive mechanism in this embodiment can also adopt other embodiments of the prior art, such as screw transmission; as for the power transmission method, the main method is to enable the movable frame 11, and its transmission form is adjusted and selected according to actual conditions.

[0048] See also Figure 5 The movable frame 11 includes two supporting members 25 and an intermediate connecting member. The two supporting members 25 are arranged opposite each other and are slidably connected to the top of the inner cavity of the sandblasting box 1. The intermediate connecting member is connected between the two supporting members 25, and the plurality of sandblasting nozzles 2 are arranged on the intermediate connecting member. The second synchronous belt 16 transmission assembly is located between the two supporting members 25.

[0049] Furthermore, the intermediate connector in this embodiment includes a connecting plate 26 and a vertical plate 27. The connecting plate 26 is connected to the two support members 25 to form a U-shaped structure. The vertical plate 27 is connected to the connecting plate 26 on one side and extends downward on the other end. Several sandblasting nozzles 2 are disposed on the vertical plate 27. By providing such an intermediate connector, the height of the sandblasting nozzles 2 can be lowered, making the distance between the sandblasting nozzles 2 and the metal pipe A more appropriate, thereby improving the sandblasting impact effect. In addition, multiple installation positions at different heights can be provided on the vertical plate 27 of this embodiment. By fixing each sandblasting nozzle 2 through a detachable connection method such as a bolt structure, the height of the sandblasting nozzles 2 can be changed on the vertical plate 27 to meet the sandblasting requirements of different metal pipes A.

[0050] In order to achieve a fixed connection between the movable frame 11 and one side of the second synchronous belt 16, in this embodiment, a clamping block 28 is connected to the connecting plate 26. The clamping block 28 clamps and fixes the second synchronous belt 16 through two detachable clamping blocks, thereby achieving synchronous movement of the movable frame 11 when the second synchronous belt 16 moves.

[0051] See also Figure 5 A guide assembly is provided between the two support members 25 and the top of the inner cavity of the sandblasting box 1. The guide assembly includes a guide rail 23 and a slider 24. The guide rail 23 is fixedly connected to the sandblasting box 1, and the slider 24 is fixedly connected to the support member 25. The provision of the guide assembly not only improves the movement stability of the movable frame 11, but also guides and limits the reciprocating movement of the movable frame 11, improving its movement accuracy, thereby better guiding the sandblasting nozzle 2 to evenly sandblast the metal pipe A.

[0052] See also Figure 5 In this embodiment, three sandblasting nozzles 2 are provided, arranged in a straight line and perpendicular to the axis of the metal pipe A. This arrangement of the sandblasting nozzles 2 can increase the sandblasting range and ensure that the outer wall of the metal pipe A is impacted by the sand medium. In addition, the angle of the sandblasting nozzles 2 can be adjusted to further increase the flexibility of the sandblasting angle and range. Moreover, in addition to the arrangement of the multiple sandblasting nozzles 2 in this embodiment, the multiple sandblasting nozzles 2 can also be arranged along the axis of the metal pipe A, or the multiple sandblasting nozzles 2 can be arranged in a ring, etc., and this embodiment is not limited to any of these arrangements.

[0053] See also Figure 1-Figure 2 The air knife 3 of this embodiment is installed on the inner wall of the sandblasting chamber 1, with the air outlet of the air knife 3 acting on the metal pipe A. The air knife 3 is connected to a blower. Specifically, the air knife 3 of this embodiment is installed on the side wall of the sandblasting chamber 1, has a long strip shape, and is provided with multiple high-pressure air outlet holes. Through the installation of the air knife 3, after the sandblasting process is completed, the high-pressure gas ejected by the air knife 3 can remove the abrasive medium adhering to the outer surface of the metal pipe A.

[0054] See also Figure 1-Figure 3 , and also includes an abrasive circulation system; the abrasive circulation system includes a sand receiving trough 6, a sand storage trough 7, and an abrasive delivery pipeline 8. A partition 10 is provided within the sandblasting chamber 1. The sand receiving trough 6 is located in the middle of the partition 10 and has an inverted conical shape. Two clamping support members 5 are provided on the partition 10 and on either side of the sand receiving trough 6. The sand storage trough 7 is located below the partition 10 and communicates with the sand receiving trough 6. The sand storage trough 7 is connected to the sandblasting mechanism 9 via the abrasive delivery pipeline 8, supplying the abrasive medium to the sandblasting mechanism 9.

[0055] When the metal pipe A is sandblasted, the sand medium falls into the sand receiving trough 6 and is stored in the sand storage trough 7 under the guidance of the sand receiving trough. Since the sand storage trough 7 is connected to the sandblasting mechanism 9 through the sand conveying pipe 8, the sand supply module of the sandblasting mechanism 9 can suck the sand medium in the sand storage trough 7 to the sandblasting nozzle 2 for re-spraying, thereby realizing the recycling of the sand medium.

[0056] The specific implementation of the sandblasting mechanism 9 of this embodiment can be referred to the prior art, and generally includes a pipeline, an air compressor, an abrasive material supply module, etc.

[0057] To facilitate the disassembly and assembly of the metal pipe A and the core rod B, a movable door (hidden in the figure) that can be opened and closed is set on one side of the sandblasting box 1. To further facilitate the observation of the processing situation, the movable door can be set to transparent or translucent so that it can be observed from outside the sandblasting box 1.

[0058] See also Figures 1-6 The working principle of the sandblasting device for separating the metal tube A from the drawing core rod B in this embodiment is as follows:

[0059] The metal tube A and core rod B to be separated are mounted and fixed on a clamping and rotating mechanism. Because core rod B is longer than metal tube A and its ends extend beyond metal tube A, this characteristic allows two clamping support members 5 to clamp each end of core rod B. Next, the sandblasting mechanism 9 operates, with the sandblasting nozzle 2 spraying high-speed abrasive media onto the surface of metal tube A. The rotary drive mechanism and the linear drive mechanism operate synchronously, with the rotary drive mechanism driving the two clamping support members 5 to rotate 360°, while the linear drive mechanism drives the sandblasting nozzle 2 to reciprocate linearly along the axis of core rod B, ensuring that the high-speed abrasive media evenly impacts the outer surface of metal tube A. As the high-speed abrasive media impacts the outer wall of metal tube A, it generates a uniform and subtle cutting force or mechanical stress, thereby creating a certain gap between metal tube A and core rod B. Finally, the sandblasting mechanism 9 and the clamping and rotating mechanism stop working, and the two ends of the core rod B are loosened by the clamping support component 5. After being taken out, the metal pipe A and the core rod B can be separated.

[0060] Example 2

[0061] This embodiment is a specific implementation method for separating the metal tube A and the drawing core rod using the sandblasting device for separating the metal tube and the drawing core rod in Example 1 as a processing device to separate the metal tube A and the core rod B that are in close contact. Specifically:

[0062] The ends of a metal tube A with a core rod B are fixed. The outer diameter of the metal tube A is φ5.5 mm, and the wall thickness is 0.5 mm. Specifically, the ends of the core rod B extending from the ends of the metal tube A are clamped and fixed by two clamping support members 5. Subsequently, a sandblasting mechanism 9 is controlled to uniformly sandblast the surface of the metal tube A for 15 minutes at a pressure of 0.25 MPa. The sandblasting medium is corundum with a particle size of 35 μm. The distance between the sandblasting nozzle 2 and the surface of the metal tube A is controlled to be 270 mm. Simultaneously, a rotary drive mechanism drives the clamping assembly to rotate the core rod B and the metal tube A. A linear drive mechanism drives the movable frame 11 to reciprocate the sandblasting nozzle 2 along the axis of the core rod B. After the specified time of sandblasting is completed, the surface of the metal pipe A is subjected to air showering and dust removal by using the air knife 3. Then, the sandblasting box 1 is opened and the core rod B is released after the clamping support component 5. The core rod B and the metal pipe A are taken out. Finally, the core rod B is extracted from one end of the metal pipe A to obtain a hollow metal pipe A.

[0063] During the experiment, it was found that the micro-gap between the metal tube A and the core rod B was 25μm when measured by an image measuring instrument, and the surface roughness of the tube was Ra0.4 when measured by a roughness measuring instrument. The surface quality and dimensional accuracy of the obtained metal tube A were both good.

[0064] Example 3

[0065] The difference between this embodiment and embodiment 2 is that:

[0066] The outer diameter of the metal tube A is φ3.0 mm and the wall thickness is 0.35 mm. The blasting pressure of the sandblasting mechanism 9 is 0.18 MPa. The sand medium is corundum with a particle size of 25 μm. The distance between the sandblasting nozzle 2 and the surface of the metal tube A is 210 mm.

[0067] During the experiment, it was found that the micro-gap between the metal tube A and the core rod B was 19 μm when measured by an image measuring instrument, and the surface roughness of the tube was Ra 0.25 when measured by a roughness measuring instrument. The surface quality and dimensional accuracy of the obtained metal tube A were both good.

[0068] Example 4

[0069] The outer diameter of the metal tube A is φ1.5 mm and the wall thickness is 0.05 mm. The blasting pressure of the sandblasting mechanism 9 is 0.15 MPa. The sand medium is 35 μm corundum. The distance between the sandblasting nozzle 2 and the surface of the metal tube A is 160 mm.

[0070] During the experiment, it was found that the micro-gap between the metal tube A and the core rod B was 15μm when measured by an image measuring instrument, and the surface roughness of the tube was Ra0.35 when measured by a roughness measuring instrument. The surface quality and dimensional accuracy of the obtained metal tube A were both good.

[0071] Example 5

[0072] The outer diameter of the metal tube A is φ0.8 mm and the wall thickness is 0.05 mm. The blasting pressure of the sandblasting mechanism 9 is 0.1 MPa. The sand medium is 20 μm corundum. The distance between the sandblasting nozzle 2 and the surface of the metal tube A is 100 mm.

[0073] During the experiment, it was found that the micro gap between the metal tube A and the core rod B was 13μm when measured by an image measuring instrument, and the surface roughness of the tube was Ra0.2 when measured by a roughness measuring instrument. The surface quality and dimensional accuracy of the obtained metal tube A were both good.

[0074] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Therefore, any modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A sandblasting device for separating a metal pipe from a drawing core rod, characterized in that: It includes a sandblasting box, a sandblasting mechanism and a clamping and rotating mechanism; the sandblasting mechanism and the clamping and rotating mechanism are both arranged in the sandblasting box; wherein, The clamping and rotating mechanism includes two clamping support components for clamping the ends of the core rod and a rotation driving mechanism for driving the two clamping support components to rotate along the circumference of the core rod, and the two clamping support components are arranged opposite to each other; The sandblasting mechanism includes several sandblasting nozzles, and several of the sandblasting nozzles are located above the clamping and rotating mechanism; a linear drive mechanism for driving the sandblasting nozzles to move back and forth linearly is provided at the top of the inner cavity of the sandblasting box; several of the sandblasting nozzles are arranged on the power output part of the linear drive mechanism, and the sandblasting direction of several of the sandblasting nozzles is downward.

2. The sandblasting device for separating a metal tube from a drawing core rod according to claim 1, characterized in that: The clamping support component includes a support frame and a clamping assembly arranged on the support frame. The clamping assembly includes a base and at least three clamping jaws. Each of the clamping jaws is evenly distributed on the base and can move in a radial direction toward or away from the center of the base to achieve clamping or loosening of the core rod end.

3. The sandblasting device for separating a metal tube from a drawing core rod according to claim 2, characterized in that: The clamping assembly further includes a rotating shaft; the base is fixedly connected to one end of the rotating shaft, and the rotating shaft is rotatably connected to the support frame.

4. The sandblasting device for separating a metal tube from a drawing core rod according to claim 3, characterized in that: The rotary drive mechanism includes a first power source and a first synchronous belt transmission assembly, the first synchronous belt transmission assembly includes a first driving wheel, a first driven wheel and a first synchronous belt; the first driving wheel is connected to the power output member of the first power source, the first driven wheel is connected to the end of the rotating axis of one of the clamping support components away from the base, and the first synchronous belt is wrapped around the first driving wheel and the first driven wheel.

5. The sandblasting device for separating a metal tube from a drawing core rod according to any one of claims 1 to 4, characterized in that: The linear drive mechanism includes a movable frame and a second power source; the movable frame is slidably arranged on the top of the sandblasting box, and driven by the second power source, the movable frame drives the plurality of sandblasting nozzles to reciprocate along the core rod axis.

6. The sandblasting device for separating a metal tube from a drawing core rod according to claim 5, characterized in that: The linear drive mechanism also includes a second synchronous belt transmission assembly, which includes a second driving wheel, a second driven wheel and a second synchronous belt. The second driving wheel and the second driven wheel are both rotatably arranged on the top of the inner cavity of the sandblasting box, and the power output member of the second power source is connected to the second driving wheel. The second synchronous belt is arranged around the second driving wheel and the second driven wheel; the movable frame is connected to one side of the second synchronous belt.

7. The sandblasting device for separating a metal tube from a drawing core rod according to claim 6, characterized in that: The movable frame includes two supporting members and an intermediate connecting member, the two supporting members are arranged opposite to each other and are slidably connected to the top of the inner cavity of the sandblasting box, the intermediate connecting member is connected between the two supporting members, and the plurality of sandblasting nozzles are arranged on the intermediate connecting member; The second synchronous belt transmission assembly is located between the two support members.

8. The sandblasting device for separating a metal tube from a drawing core rod according to claim 7, characterized in that: A guide assembly is provided between the two support members and the top of the inner cavity of the sandblasting box; the guide assembly includes a guide rail and a slider, the guide rail is fixedly connected to the sandblasting box, and the slider is fixedly connected to the support member.

9. The sandblasting device for separating a metal tube from a drawing core rod according to claim 1, characterized in that: It also includes an air knife, which is arranged on the inner wall of the sandblasting box, and the air outlet direction of the air knife acts on the metal pipe, and the air knife is connected to the fan.

10. The sandblasting device for separating a metal tube from a drawing core rod according to claim 1, characterized in that: It also includes a sand material circulation system; the sand material circulation system includes a sand receiving trough, a sand storage trough and a sand material conveying pipeline; A partition is provided in the sandblasting box, the sand receiving trough is provided in the middle of the partition, the sand receiving trough is in an inverted cone shape, and the two clamping support components are provided on the partition and located on both sides of the sand receiving trough; The sand storage tank is arranged below the partition and is communicated with the sand receiving tank; the sand storage tank is connected to the sand blasting mechanism through the sand material conveying pipeline to supply sand material medium to the sand blasting mechanism.

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