Metal bellows bending forming mechanism

Abstract

The application provides a metal bellows bending forming mechanism, which comprises a rack, a hoop assembly, a traction device and a controller, the traction device comprises a motor, a traction chain and a clamp, the motor, the controller and the hoop assembly are all installed on the rack, the motor output shaft is fixedly connected with a ball screw, the ball screw is screwed with a sliding block, the clamp comprises a bearing plate, one end of the traction chain is hung with the bearing plate, the other end of the traction chain is hung with the sliding block, the controller is electrically connected with the motor control end, and each parameter for bending forming of the metal bellows is stored in the controller. Compared with the prior art, the technical scheme of the application keeps the force applied to the stress point of the metal bellows balanced, makes the actual curvature radius of the metal bellows consistent with the preset curvature radius, improves the bending forming precision of the metal bellows, and reduces the damage of the outer surface of the metal bellows in the bending process, thereby laying a foundation for the later anti-leakage test.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building material measurement, and particularly relates to a metal corrugated pipe bending forming mechanism. BACKGROUND

[0002] The experience of using metal corrugated pipes in the engineering field has been nearly 200 years. With the vigorous development of urban construction, the types and quality of metal corrugated pipes have been greatly improved. Generally speaking, various types of metal corrugated pipes nowadays have the advantages of convenient manufacturing, low price, good sealing performance, corrosion resistance and the like. However, such a large amount and such a wide range of use of metal corrugated pipes inevitably requires that the quality of the metal corrugated pipes be guaranteed. In fact, for the purpose of guidance, the Ministry of Construction of China has promulgated relevant detection standards for metal corrugated pipes, namely JG / T225-2020 “Metal Corrugated Pipe for Prestressed Concrete”. According to the relevant provisions of JG / T225-2020 “Metal Corrugated Pipe for Prestressed Concrete”, before the application of this type of metal corrugated pipe, it is necessary to test whether the metal corrugated pipe leaks in the bent state. According to the relevant provisions in the above standard, when testing, the metal corrugated pipe test piece needs to be cut to a length of 1500mm, the test piece is bent into an arc shape, and the ratio of the curvature radius of the bent metal corrugated pipe to its nominal inner diameter is 30:1. Then, one end of the metal corrugated pipe is closed, and cement mortar is poured from the other end of the metal corrugated pipe. If there is no leakage on the outer surface of the metal corrugated pipe, it means that the metal corrugated pipe meets the requirements, otherwise it is unqualified.

[0003] In the prior art, a patent document with publication number “CN109675979A” discloses a fan-type metal corrugated pipe plane bending device. The device is composed of a bending system, a fixing system and a shaping system. Through the cooperation of the various elements of the device support system, the device can be quickly installed. Then, the main arm and the auxiliary arm of the device are used to fix the metal corrugated pipe. Subsequently, the device interval swing is used to bend the metal corrugated pipe into the required corresponding circular arc shape. Finally, the shaping rod of the device can be used to maintain and strengthen the circular arc shape of the metal corrugated pipe until the pipe line meets the test requirements. The device solves the problem that the pipe sample cannot be accurately bent when testing the anti-leakage performance of the metal corrugated pipe after bending. However, the device can only be used to bend one type of metal corrugated pipe, and cannot bend the metal corrugated pipe to the corresponding curvature radius according to the nominal inner diameter of the metal corrugated pipe, so the application range is limited. In addition, when the metal corrugated pipe is bent and formed, there is often an error between the actual curvature radius and the preset curvature radius, which affects the forming quality and forming effect of the metal corrugated pipe. SUMMARY

[0004] To solve the above technical problems, the present application provides a metal corrugated pipe bending forming mechanism.

[0005] The application is realized by the following technical scheme.

[0006] The application provides a metal bellows bending forming mechanism, which comprises a rack, a hoop assembly, a traction device and a controller, two ends of the metal bellows are taken as a first base point and a second base point respectively, at least one stress point is selected in the middle of the metal bellows, the traction device comprises a motor, a traction chain and a clamp, the motor, the controller and the hoop assembly are all mounted on the rack, the hoop assembly is used for clamping the first base point and the second base point, the output shaft of the motor is fixedly connected with a ball screw, the ball screw is screwed with a sliding block, the clamp is used for clamping the stress point of the metal bellows, the clamp comprises a bearing plate, one end of the traction chain is hung with the bearing plate, the other end of the traction chain is hung with the sliding block, the controller is electrically connected with the control end of the motor, the controller stores the nominal inner diameter d of the metal bellows, the interval M between the stress points relative to the first base point, the interval N between the stress points relative to the second base point, the interval L between the first base point and the second base point, and the controller is used for controlling the displacement S of the sliding block, and M, N, L and S satisfy the following relationship:

[0007] S=[min(M,N)]x{1-cos[L / (pixd)]} / sin[L / (pixd)].

[0008] A track is also mounted on the rack, the surface of the track is provided with a track groove, the clamp comprises a first supporting arm and a second supporting arm, the left and right ends of the first supporting arm are fixedly connected with the left and right ends of the second supporting arm respectively, the bearing plate is fixedly connected with the first supporting arm, the metal bellows is clamped between the first supporting arm and the second supporting arm, the left and right ends of the first supporting arm, the left and right ends of the second supporting arm and the surface of the sliding block are all provided with sliding tables, and the sliding tables are sleeved in the track groove.

[0009] The track groove or the sliding table is dovetail-shaped.

[0010] At least one positioning wheel is sleeved on the first supporting arm or the second supporting arm, the outer circumferential surface of the positioning wheel is provided with a limiting groove, the metal bellows is clamped between two positioning wheels opposite to each other and accommodated in the corresponding limiting grooves.

[0011] A rubber layer is bonded on the outer circumferential surface of the positioning wheel.

[0012] The hoop assembly comprises a hoop seat, a hoop ring, a positioning pin and a plurality of jacks, the hoop seat is fixedly connected with the rack, the hoop ring is hingedly connected with the hoop seat, one end of the positioning pin is fixedly connected with the inner surface of the hoop ring, the other end of the positioning pin is provided with a roller head, the jacks are inserted into the inner surface of the hoop ring, one end of the jack is provided with a roller head, the other end of the jack is screwed with a locking nut, the jack is also sleeved in a spring, and the spring is arranged between the inner wall of the hoop seat and the roller head.

[0013] The rack is further fixedly connected with a supporting plate, the motor is installed on the surface of the supporting plate, and the ball screw is supported on the surface of the supporting plate by using a bearing seat.

[0014] The lower end of the rack is further fixedly connected with a load-bearing base.

[0015] The number of the traction devices is multiple, and the multiple traction devices are arranged in an even array along the axial direction of the metal bellows.

[0016] The controller comprises a single-chip microcomputer with an operation word length of not less than 32 bits.

[0017] The beneficial effects of the present application are as follows: by using the technical scheme of the present application, the stress point of the metal bellows is first clamped between the first supporting arm and the second supporting arm, then the nominal outer diameter of the metal bellows and the preset displacement parameter of the sliding block are input into the controller, the controller then drives the motor to operate, so that the sliding block is displaced by a corresponding distance, so that the metal bellows is bent and formed, compared with the prior art, the force applied to the stress point of the metal bellows is kept balanced, the offset distance of the metal bellows during bending and forming is consistent with the preset displacement distance, the radius of curvature of the metal bellows reaches the preset value, the precision of the bending and forming of the metal bellows is improved, and by means of the top pin structure of the hoop, the damage to the outer surface of the metal bellows during bending can be reduced, laying a foundation for the subsequent anti-leakage test. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a schematic diagram of a regular isometric structure of the present application;

[0019] Figure 2 is a front view of the present application;

[0020] Figure 3 is a partial enlarged view of position I in the present application; Figure 2

[0021] Figure 4 is a top view of the present application;

[0022] Figure 5 is a right view of the present application;

[0023] Figure 6 is a partial enlarged view of position II in the present application; Figure 4

[0024] Figure 7 is a front view of the hoop assembly of the present application.

[0025] ​​In the diagram: 1-Frame, 2-Clamping assembly, 3-Traction device, 4-Controller, 5-Support plate, 6-Bearing seat, 7-Load-bearing base, 21-Clamp seat, 22-Clamp ring, 23-Top pin, 24-Roller top, 25-Locking nut, 26-Spring, 27-Positioning pin, 31-Motor, 32-Traction chain, 33-Clamp, 34-Ball screw, 35-Slider, 36-Bearing plate, 37-Railway, 38-Rail groove, 39-First support arm, 40-Second support arm, 41-Positioning wheel, 42-Rubber layer, 43-Limiting groove. Detailed Implementation

[0026] The technical solution of the present invention is further described below, but the scope of protection is not limited to what is described.

[0027] like Figures 1 to 7 As shown, this invention provides a metal bellows bending and forming mechanism, including a frame 1, a clamping assembly 2, a traction device 3, and a controller 4. The two ends of the metal bellows are respectively designated as a first base point and a second base point. At least one force-bearing point is selected in the middle of the metal bellows. The traction device 3 includes a motor 31, a traction chain 32, and a clamp 33. The motor 31, controller 4, and clamping assembly 2 are all mounted on the frame 1, and the clamping assembly 2 is used to clamp the first and second base points. The output shaft of the motor 31 is fixedly connected to a ball screw 34, and the ball screw 34 is screwed to a slider 35. The clamp 33 is used to hold the force-bearing point of the metal bellows. The clamp 33 includes a support plate 36. One end of the traction chain 32 is hooked to the support plate 36, and the other end of the traction chain 32 is hooked to the slider 35. The controller 4 is electrically connected to the control terminal of the motor 31. The controller 4 stores the nominal inner diameter d of the metal bellows, the distance M between the force-bearing point and the first base point, the distance N between the force-bearing point and the second base point, and the distance L between the first base point and the second base point. The controller 4 is used to control the displacement S of the slider 35, and M, N, L, and S satisfy the following relationship:

[0028] S=[min(M,N)]×{1-cos[L / (π×d)]} / sin[L / (π×d)].

[0029] The technical scheme of the present application first clamps the stress point of the metal bellows between the first supporting arm and the second supporting arm, then inputs the nominal inner diameter of the metal bellows and the preset displacement parameter of the sliding block into the controller, and the controller drives the motor to operate so that the sliding block displaces by a corresponding distance, thereby bending the metal bellows into shape. Compared with the prior art, the force applied to the stress point of the metal bellows is balanced, the bending offset distance of the metal bellows is consistent with the preset displacement distance, the curvature radius of the metal bellows reaches the preset value, the bending precision of the metal bellows is improved, and the damage to the outer surface of the metal bellows during bending is reduced by the top pin structure of the hoop, thereby laying a foundation for the subsequent anti-leakage test.

[0030] Specifically, the rack 1 is further provided with a track 37, the surface of the track 37 is provided with a rail groove 38, the clamp 33 includes a first supporting arm 39 and a second supporting arm 40, the left and right ends of the first supporting arm 39 are respectively fixedly connected with the left and right ends of the second supporting arm 40, the force bearing plate 36 is fixedly connected with the first supporting arm 39, the metal bellows is clamped between the first supporting arm 39 and the second supporting arm 40, the left and right ends of the first supporting arm 39, the left and right ends of the second supporting arm 40 and the surface of the sliding block 35 are all provided with sliding tables, and the sliding tables are sleeved in the rail groove 38. Therefore, the stress points of the metal bellows are uniformly stressed and uniformly bent into shape.

[0031] In addition, the rail groove 38 or the sliding table is dovetail-shaped. At least one positioning wheel 41 is sleeved on the first supporting arm 39 or the second supporting arm 40, the outer circumferential surface of the positioning wheel 41 is provided with a limiting groove 43, the metal bellows is clamped between the two positioning wheels 41 opposite to each other and accommodated in the corresponding limiting grooves 43. Preferably, a rubber layer 42 is bonded on the outer circumferential surface of the positioning wheel 41. Therefore, the surface of the metal bellows is prevented from being pressed or damaged.

[0032] Further, the hoop assembly 2 comprises a hoop base 21, a hoop ring 22, a positioning pin 27 and a plurality of jacks 23, the hoop base 21 is fixedly connected with the rack 1, the hoop ring 22 is hingedly connected with the hoop base 21, one end of the positioning pin 27 is fixedly connected with the inner surface of the hoop ring 22, the other end of the positioning pin 27 is provided with a roller jack 24, the jacks 23 are inserted into the inner surface of the hoop ring 22, one end of the jacks 23 is provided with a roller jack 24, the other end of the jacks 23 is screwed with a locking nut 25, the jacks 23 are further sleeved in springs 26, and the springs 26 are arranged between the inner wall of the hoop base 21 and the roller jacks 24. The number of the jacks 23 is preferably an odd number greater than 3, when clamping the metal bellows, the roller jacks 24 abut against the periphery of the first and second base points respectively, and the positioning pin 27 and the plurality of jacks 23 are uniformly arrayed along the inner surface of the hoop ring 22, so that the metal bellows is uniformly stressed on the periphery, the roller jacks 24 are integrally formed in a concave circular arc shape, so that the surface of the roller jacks 24 is in point contact with the surface of the metal bellows, and the elastic force of the springs 26 makes the surface of the metal bellows be uniformly stressed, thereby preventing the metal bellows from being broken due to excessive local stress.

[0033] In addition, the rack 1 is further fixedly connected with a support plate 5, the motor 31 is installed on the surface of the support plate 5, and the ball screw 34 is supported on the surface of the support plate 5 by using the bearing seat 6. The lower end of the rack 1 is further fixedly connected with a load-bearing base 7. The load-bearing base 7 is used to absorb the vibration generated during the operation of the motor, so as to avoid the equipment from overturning.

[0034] In addition, the number of the traction devices 3 is multiple, and the plurality of traction devices 3 are uniformly arrayed along the axial direction of the metal bellows. In order to apply force to multiple stress points of the metal bellows, so that the metal bellows is uniformly stressed and uniformly bent and formed, preferably, the controller 4 comprises a single-chip microcomputer with an operation word length of not less than 32 bits.

Claims

1. A metal bellows bending forming mechanism characterized by: The utility model relates to a metal bellows tensioning device, including frame (1), hoop assembly (2), traction device (3) and controller (4), will the both ends of metal bellows as first base point and second base point respectively, and then select at least one stress point in the middle of metal bellows, traction device (3) includes motor (31), traction chain (32) and clamp (33), motor (31), controller (4) and hoop assembly (2) are all installed on frame (1), and hoop assembly (2) is used for clamping first base point, second base point, motor (31) output shaft is connected with ball screw (34), ball screw (34) is screwed with sliding block (35), clamp (33) is used for clamping the stress point of metal bellows, the one end of traction chain (32) is hung with force plate (36), the other end of traction chain (32) is hung with sliding block (35), controller (4) and motor (31) control end electric connection, the controller (4) has stored metal bellows's nominal inside diameter d, the interval M between stress point relative to first base point, the interval N between stress point relative to second base point, the interval L between first base point and second base point, the controller (4) is used for controlling the displacement S of sliding block (35), and M, N, L, S satisfy the following relation formula: S=[min (M, N)]x{1-cos [L / (pixd)]} / sin [L / (pixd)].

2. The metal bellows bending forming mechanism according to claim 1, characterized by: The surface of track (37) is equipped with rail groove (38), first branch (39) and second branch (40) are included in clamp (33), and the left and right ends of first branch (39) are connected with the left and right ends of second branch (40) respectively, and force plate (36) is connected with first branch (39), and metal bellows is clamped between first branch (39) and second branch (40), and the surface of sliding block (35) is equipped with slide platform, and slide platform is fitted in rail groove (38).

3. The metal bellows bending forming mechanism according to claim 2, wherein: The rail groove (38) or slide platform is dovetail-shaped.

4. The metal bellows bending forming mechanism according to claim 2, wherein: At least one positioning wheel (41) is fitted on first branch (39) or second branch (40), and the outer circumferential surface of positioning wheel (41) is equipped with limiting groove (43), and metal bellows is clamped between two positioning wheels (41) opposite to each other and is accommodated in corresponding limiting groove (43).

5. The metal bellows bending forming mechanism as recited in claim 4, wherein: The outer circumferential surface of positioning wheel (41) is bonded with rubber layer (42).

6. The metal bellows bending forming mechanism of claim 1, wherein: The hoop assembly (2) comprises a hoop base (21), a hoop ring (22), a positioning pin (27) and a plurality of jacks (23), the hoop base (21) is fixedly connected with the frame (1), the hoop ring (22) is hingedly connected with the hoop base (21), one end of the positioning pin (27) is fixedly connected with the inner surface of the hoop ring (22), the other end of the positioning pin (27) is provided with a roller jack (24), the jack (23) is inserted into the inner surface of the hoop ring (22), one end of the jack (23) is provided with a roller jack (24), the other end of the jack (23) is screwed with a locking nut (25), the jack (23) is further sleeved in a spring (26), and the spring (26) is arranged between the inner wall of the hoop base (21) and the roller jack (24).

7. The metal bellows bend forming mechanism of claim 1, wherein: The frame (1) is further fixedly connected with a supporting plate (5), the motor (31) is mounted on the surface of the supporting plate (5), and the ball screw (34) is supported on the surface of the supporting plate (5) by using a bearing seat (6).

8. The metal bellows bending forming mechanism according to claim 1 or 2 or 7, characterized by: The lower end of the frame (1) is further fixedly connected with a load-bearing base (7).

9. The metal bellows bend forming mechanism of claim 1, wherein: The number of the traction devices (3) is multiple, and the multiple traction devices (3) are uniformly arranged along the axial direction of the metal corrugated pipe.

10. The metal bellows bending forming mechanism of claim 1, wherein: The controller (4) comprises a single-chip microcomputer with an operation word length of not less than 32 bits.

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