A square long tube straightening device

Abstract

The present invention discloses a square long tube straightening device, comprising a straightening mechanism that can be driven to move up and down, the straightening mechanism further comprising a straightening sleeve, a limit block whose inner side surface forms a limit surface that matches the cross section of the square long tube is installed on the upper inner side of the straightening sleeve, a pressure sensor is installed on the inner side of the limit block, a straightening module driven by a straightening oil cylinder to straighten the workpiece is installed on the middle inner side of the straightening sleeve, the number of the straightening modules is the same as the number of planes on the outer peripheral surface of the straightened part, each straightening module acts on a plane on the outer peripheral surface of the straightened part to straighten, and a clamp driven by a clamping oil cylinder to clamp the workpiece is arranged relatively on the lower inner side of the straightening sleeve. The present invention can realize the upward movement of the workpiece section by section for straightening after the workpiece is clamped, and ensure the high precision requirement of straightening.

Description

Technical Field

[0001] The invention relates to the technical field of pipe straightening, in particular to a square long pipe straightening device. Background Art

[0002] The production of square tubes is completed through rolling and stretching processes. Whether it is hot or cold rolling or hot or cold stretching, it will produce different degrees of deformation. The conventional hydraulic press manual straightening process cannot meet the high-precision requirements of special industries such as military and aerospace. Summary of the invention

[0003] The purpose of the present invention is to provide a high-precision square long tube straightening device to address the defects in the above-mentioned prior art. The device determines the degree of bending through the detection signal of the pressure sensor, and then applies pressure to the bent side. Repeated detection and repeated pressure are used to straighten the tube in stages, so that the straightness of the long tube can be corrected to within 0.3mm.

[0004] The technical solution adopted to achieve the purpose of the present invention is:

[0005] A square long tube straightening device comprises a straightening mechanism that can be driven to move up and down, the straightening mechanism further comprises a straightening sleeve, a limit block whose inner side surface forms a limit surface that matches the cross-section of the square long tube is installed on the upper inner side of the straightening sleeve, a pressure sensor is installed on the inner surface of the limit block, a straightening module driven by a straightening cylinder to straighten the workpiece is installed on the middle inner side of the straightening sleeve, the number of the straightening modules is the same as the number of planes on the outer peripheral surface of the straightened part, each straightening module acts on a plane on the outer peripheral surface of the straightened part to straighten it, and a clamp driven by a clamping cylinder to clamp the workpiece is arranged relatively on the lower inner side of the straightening sleeve.

[0006] As a preferred technical solution, the straightening mechanism is equipped with a clamping and locking mechanism for clamping and locking one end of the square long tube to be calibrated, and then the straightening mechanism moves upward to perform straightening section by section.

[0007] As a preferred technical solution, the clamping and locking mechanism includes a fixed block installed on the base for initial fixation of the workpiece, a clamping block is arranged inside the fixed block, and a locking block driven by a locking cylinder vertically arranged on the base is arranged on the outer side of the clamping block, and the locking block and the clamping block are connected by a conical inclined surface.

[0008] As a preferred technical solution, the straightening mechanism is connected to a lifting mechanism, and the lifting mechanism is used to drive the straightening mechanism to move upward to straighten the workpiece segments, and reset the straightening mechanism after the straightening is completed.

[0009] As a preferred technical solution, the clamping and locking mechanism and the lifting mechanism are installed on a movable trolley.

[0010] The square long tube straightening device of the present invention can realize the straightening of the workpiece section by section by moving the straightening mechanism driven to move up and down after the workpiece is clamped, thereby ensuring the high precision requirement of straightening. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a square long tube straightening device of the present invention.

[0012] Figure 2 It is a cross-sectional structural diagram of the correction mechanism;

[0013] Figure 3 It is a cross-sectional top view of the correction mechanism;

[0014] Figure 4 It is a cross-sectional axonometric structural diagram of the correction mechanism;

[0015] Figure 5 It is a schematic cross-sectional diagram of the arrangement of the straightening cylinder and the straightening module on the upper part of the correction mechanism;

[0016] Figure 6 It is a schematic cross-sectional view of the arrangement of the clamping cylinder and the clamp in the middle of the correction mechanism;

[0017] Figure 7 is a schematic cross-sectional view of the arrangement of the clamping and locking mechanism at the lower part of the correction mechanism;

[0018] Figure 8 It is a schematic diagram of the axonometric structure of the fixed block;

[0019] In the figure: 1. Pressure sensor 2. Limit block 3. Straightening cylinder 4. Straightening module 5. Straightening sleeve 6. Clamping cylinder 7. Clamp 8. Fixing block 9. Clamping block 10. Locking block 11. Locking cylinder 12. Base 13. Square long tube 20. Straightening mechanism 21. Lifting mechanism 22. Cart 23. Pump station 24. Square long tube. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] like Figure 1As shown, the square long tube straightening device provided by the present invention includes a clamping and locking mechanism and a straightening mechanism 20 arranged above the clamping and locking mechanism, wherein the clamping and locking mechanism is used to clamp and lock one end of the square long tube to be calibrated, and then the straightening mechanism is used to straighten it; wherein the straightening mechanism further includes a straightening sleeve 5, a limit block 2 whose inner side surface forms a limit surface that matches the cross-section of the square long tube is installed on the upper inner side of the straightening sleeve, and a pressure sensor 1 is installed on each limit surface of the limit block, and a straightening module 4 driven by a straightening cylinder 3 to straighten the workpiece is installed on the middle inner side of the straightening sleeve, and the number of the straightening modules 4 is the same as the number of planes on the outer peripheral surface of the straightened part, and each straightening module acts on a plane on the outer peripheral surface of the straightened part to straighten it, and a clamp 7 driven by a clamping cylinder 6 to clamp the workpiece is arranged on the lower inner side of the straightening sleeve, and the clamp 7 is two and arranged oppositely.

[0022] In the present invention, there are two clamping cylinders, which are used for ejection clamping and adjustable pressure; the number of straightening cylinders is determined according to the number of planes of the square tube, and the pressure is adjustable. The shape formed by the inner side surface of the limit block is adapted to the shape of the cross section of the square tube to be processed, and has the same number of limit planes as the number of outer planes of the square tube to limit the maximum bending value of the workpiece, and a pressure sensor is installed on each plane to detect the pressure value.

[0023] During the straightening operation, after one end of the workpiece to be straightened, the square long tube 13 (hexagonal long tube), is clamped, the straightening part of the mechanism starts to work, and the straightening clamp 7 is a distance from the limit block 2. The hydraulic cylinder 6 pushes the clamp 7 inward to clamp the square long tube, and the pressure sensor 1 starts to work, judging the size of the pressure signal, and outputs signals in the two directions with greater pressure, so that the hydraulic cylinder 3 on the opposite side is pushed out, and pressure is applied to the square long tube through the straightening module 4. Repeat the above judgment and pressure application actions until the difference in the pressure sensor signal is controlled within a certain range, and the straightening of a distance in the straightening sleeve 5 is completed. Then, the straightening sleeve 5 is lifted by the lifting mechanism 21 to start the next stage of straightening.

[0024] It should be noted that, in the present invention, the clamping and locking mechanism can be implemented by using an oil cylinder and a clamping device driven by the oil cylinder, and can be implemented by using any available mechanism that can clamp a square tube, without specific limitation.

[0025] In order to further facilitate use, the present invention proposes a clamping and locking mechanism that cooperates with the straightening mechanism, such as Figure 2 , 4As shown in , it includes a fixed block 8 installed on a base 12, which is responsible for the initial fixation of the square long tube. A matching clamping block 9 is installed between adjacent vertical limiting edges of a plurality of spaced vertical limiting edges 81 of the fixed block 8 through an inclined surface 82, so as to limit the clamping block between two vertical limiting edges and prevent it from falling out. The number of the clamping blocks 9 is the same as the number of edges on the cross section of the square long tube to be clamped. A locking block 10 driven by a locking cylinder 11 vertically arranged on the base 12 is provided on the outer side of the clamping block 9, and the locking block 10 is connected to the clamping block 9 through a tapered inclined surface.

[0026] Specifically, the inner side surface of the clamping block is adapted to the shape of the outer surface of the workpiece, and can achieve surface contact clamping with the outer surface of the workpiece.

[0027] The locking block is a cylindrical or ring-shaped structure, which is sleeved on the outside of the fixed block 8. The bottom is connected to two locking cylinders 11, and is driven by the locking cylinders to move up and down, thereby driving the clamping block to move from the outside to the inside, thereby clamping the square long tube 13.

[0028] Specifically, the fixed block 8 is a welding structure, including a top limit ring 80, a bottom limit ring 83, and a plurality of vertical limit edges 81 fixed between the top limit ring 80 and the bottom limit ring 83. In the initial state, the bottom of the clamping block contacts the upper surface of the bottom limit ring. In the clamping state, it is limited by the lower surface of the top limit ring after moving upward and inward, thereby realizing the upper and lower position limitation of the clamping block. The inner side of the fixed block 8 is welded after fine machining and fixed to the base with bolts through the bottom limit ring. The inner side surfaces of the top limit ring 80 and the bottom limit ring 83 form a limit surface 84 with the same number of sides as the cross section of the clamped square long tube. The function of the vertical limit edge 81 is to fix the vertical movement direction of the clamping block 9 in the direction of the edge normal of the vertical limit edge 81.

[0029] Among them, the number of the clamping blocks 9 is the same as the number of edges of the square long tube to be corrected, the outer side has an angle of 7 degrees, and the inner side of the locking block 10 has an angle of 7 degrees. When the locking block 10 is pushed upward, the clamping block is squeezed and moved inward to clamp one end of the square long tube. When the locking block 10 is downward, the clamping block 9 is automatically loosened, and the square long tube can be taken out.

[0030] The clamping and locking mechanism and the correction mechanism are separated. The clamping and locking mechanism is fixed on the base and does not move, while the correction mechanism will be lifted by the lift in stages. The lift will lift the correction mechanism a certain distance each time the correction is completed.

[0031] When one end of the straightened square long tube is placed in the fixed block 8, the locking cylinder 11 extends upward to push the locking block 10 upward. The locking block 10 is connected to the conical surface of the clamping block 9. When the locking block 10 moves upward, the clamping block 9 moves inward under the restriction of the fixed block 8 above, thereby clamping the end of the square long tube 13.

[0032] In the present invention, there are two locking oil cylinders, and the operating pressure is adjustable.

[0033] During the straightening work, one end of the square long tube to be straightened is inserted into the fixed block 8, and the locking cylinder 11 pushes the locking block 10 upward. The locking block 10 is connected to the conical surface of the clamping block 9. When the locking block 10 moves upward, the clamping block 9 moves inward under the restriction of the fixed block 8 to clamp the end of the square long tube.

[0034] After one end of the square tube is clamped, the straightening clamp 7 is aligned to a distance from the limit block 2. The hydraulic cylinder 6 pushes the clamp 7 inward to clamp the square tube, and the pressure sensor 1 starts to work to determine the size of the pressure signal. The two directions with greater pressure output signals push out the hydraulic cylinder 3 on the opposite side, and apply pressure to the square tube through the straightening module 4. Repeat the above pressure signal judgment and pressure application actions until the signal difference of all pressure sensors 1 is controlled within a certain range, and the straightening of a section of the tube in the straightening sleeve 5 is completed.

[0035] The straightening sleeve 5 is lifted by the lifting mechanism to start the next stage of straightening, and the above process is repeated until all the long pipes are straightened.

[0036] The above is an explanation using a hexagonal long tube as an example. In fact, the technology of the present invention can be used not only for the straightening of hexagonal long tubes, but also for the straightening of other square long tubes with triangular, lower square, or regular polygonal cross-sections, and is not limited to the above-mentioned embodiments.

[0037] The present invention also provides a straightening device using the above-mentioned straightening mechanism, including a clamping and locking mechanism and a straightening mechanism 20 arranged above the clamping and locking mechanism, the straightening mechanism 20 is installed on a lifting mechanism 21, and the lifting mechanism 21 is hydraulically driven to drive the straightening mechanism 20 to rise or fall in a vertical direction to achieve mobile straightening of upright pipes. The clamping and locking mechanism, the straightening mechanism 20, the lifting mechanism 21 and the pump station 23 providing hydraulic power can be integrated together and installed on a movable cart 22 for convenient mobile use.

[0038] It should be noted that in the present invention, the above-mentioned lifting mechanism 21 is fixed to the outer side surface of the straightening sleeve 5 of the straightening mechanism 20, and can be implemented by any available vertical lifting platform or mechanism in the prior art, or hydraulic power, or motor power, etc., without specific limitation.

[0039] The high-precision square long tube straightening device of the present invention can judge the degree of bending through the signal of the pressure sensor, and then apply pressure to the bent side, repeat the detection and repeated pressure, and straighten in stages, so as to achieve the straightness correction of the long tube to within 0.3mm.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A square long tube straightening device, characterized in that: It comprises a straightening mechanism which can be driven to move up and down, the straightening mechanism further comprises a straightening sleeve, a limit block whose inner side surface forms a limit surface matching the cross section of the square long tube is installed on the upper inner side of the straightening sleeve, a pressure sensor is installed on the inner surface of the limit block, a straightening module driven by a straightening cylinder to straighten the workpiece is installed on the middle inner side of the straightening sleeve, the number of the straightening modules is the same as the number of planes on the outer peripheral surface of the straightened part, each straightening module acts on a plane on the outer peripheral surface of the straightened part to straighten it, and a clamp driven by a clamping cylinder to clamp the workpiece is arranged relatively on the lower inner side of the straightening sleeve.

2. The square long tube straightening device according to claim 1, characterized in that: The straightening mechanism is provided with a clamping and locking mechanism for clamping and locking one end of the square long tube to be calibrated, and then the straightening mechanism moves upwards to perform straightening section by section.

3. The square long tube straightening device according to claim 2, characterized in that: The clamping and locking mechanism includes a fixing block installed on the base for initial fixing of the workpiece, a clamping block is arranged inside the fixing block, and a locking block driven by a locking cylinder vertically arranged on the base is arranged on the outer side of the clamping block, and the locking block and the clamping block are connected by a conical inclined surface.

4. The square long tube straightening device according to claim 2 or 3, characterized in that: The straightening mechanism is connected to the lifting mechanism, and the lifting mechanism is used to drive the straightening mechanism to move upward to straighten the workpiece sections, and reset the straightening mechanism after the straightening is completed.

5. The square long tube straightening device according to claim 4, characterized in that: The clamping and locking mechanism and the lifting mechanism are installed on a movable trolley.

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