A fixing device and fixing method for controlling the accuracy of concentric reducers.

Abstract

This invention discloses a fixing device and method for controlling the accuracy of concentric reducers, belonging to the technical field of concentric reducer pipe fittings. It addresses the problem of inconvenient operation and poor accuracy in controlling the concentricity of the two ends of a sheet metal part after layout processing and butt welding to form a reducing pipe fitting. The device includes a worktable, a placement frame fixed to the top surface of the worktable, a placement cylinder rotatably connected to the top surface of the worktable below the placement frame, a conical block fixed at the center of the placement cylinder, and a positioning mechanism located on the inner wall of the placement cylinder around the conical block. This invention uses the conical block to place two aligned and assembled samples, and the positioning mechanism to clamp the bottom outer surface of the samples. An elastic clamping block provides elastic clamping to the top outer surface of the samples, and a calibration sleeve calibrates the concentricity of the top center of the samples. Through fine-tuning by the control mechanism, the concentricity accuracy of the smaller end of the sample and the calibration sleeve is further improved.

Description

Technical Field

[0001] This invention belongs to the technical field of concentric reducer fittings, specifically relating to a fixing device and fixing method for controlling the accuracy of concentric reducers. Background Technology

[0002] Concentric reducers are a type of reducing pipe, also known as reducing pipes. They are commonly used reducing pipes in pipeline installation for connecting two pipes of different diameters. According to their shape, they can be divided into RC concentric reducers and RE eccentric reducers. Most pipe networks require reducing pipes.

[0003] Currently, RC concentric reducer fittings are typically made by laying out two isosceles trapezoidal sheet metal parts, aligning the ends of the two concentric reducers, and then welding them together. To improve the accuracy of the butt welding of the reducer ends, the accuracy of the two laid-out sheet metal parts must be strictly controlled during the butt welding process, and the ease of operation during the butt welding process is also very important.

[0004] Therefore, a fixing device and fixing method for controlling the accuracy of concentric reducers are needed to solve the problems of inconvenience and poor accuracy in controlling the concentricity of the two ends of the reducers when butt welding sheet metal parts that have been laid out to form pipe fittings of different diameters. Summary of the Invention

[0005] The purpose of this invention is to provide a fixing device and method for controlling the accuracy of concentric reducers, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fixing device for controlling the accuracy of concentric large and small heads, comprising a worktable, a placement frame fixed on the top surface of the worktable, a placement cylinder rotatably connected to the top surface of the worktable below the placement frame, a conical block fixed at the center of the placement cylinder, a positioning mechanism located on the inner wall of the placement cylinder around the conical block, an electric push rod fixed to the bottom surface of the placement frame above the conical block, a U-shaped frame fixed at the output end of the electric push rod, a pressing plate fixed on the bottom surface of the U-shaped frame, four symmetrically distributed elastic clamping blocks fixed on the bottom surface of the pressing plate, an adjusting cylinder fixedly penetrating the center of the pressing plate between the four elastic clamping blocks, a calibration sleeve fixed between the outer surface of the adjusting cylinder and the bottom surface of the pressing plate, and an adjustment mechanism between the pressing plate and the adjusting cylinder.

[0007] It should be noted in the solution that the positioning mechanism includes four evenly distributed guide blocks, each of which is fixed in contact with the inner wall of the placement cylinder. A positioning rod slides through the guide block and the placement cylinder, and a positioning block is fixed to the inner end of each of the four positioning rods. A positioning spring is provided on the outer surface of the positioning rod and is fixed to the opposite surface of the positioning block and the guide block.

[0008] In a preferred embodiment, the opposing surfaces of the four positioning blocks are all arc-shaped, and the top surfaces of the four positioning blocks are all chamfered.

[0009] It is further worth noting that the control mechanism includes a fixed block fixed to the bottom surface of the adjustment cylinder, four symmetrically distributed control blocks rotatably connected to the top surface of the fixed block, four symmetrically distributed through slots on the outer surface of the adjustment cylinder, a slider slidably connected to the inner wall of the adjustment cylinder between the four through slots, a support spring fixed to the opposite surface of the slider and the fixed block, a connecting rod hinged between the outer surface of the slider and the outer surface of the control block, a vertical rod fixed to the top surface of the slider, a pressing block penetrating two through slots fixed to the top of the vertical rod, a guide cylinder fixed to the top surface of the pressing plate, a sliding sleeve slidably connected to the inner wall of the guide cylinder, a pushing block cooperating with the pressing block fixed to the outer surface of the sliding sleeve, an mounting block fixed to the top surface of the pressing plate at the outer end of the guide cylinder, and a control bolt extending into the sliding sleeve through the inner wall of the mounting block.

[0010] In a preferred embodiment, the vertical cross-section of the pushing block is arranged in a right-angled trapezoid, the vertical cross-section of the pressing block is arranged in a right-angled triangle, and the contact surface between the pushing block and the pressing block is a matching inclined surface.

[0011] Furthermore, it should be noted that the bottom surface of the placement cylinder is provided with a support sleeve fixed to the top surface of the workbench, the inside of the support sleeve is provided with a gear a fixed coaxially with the placement cylinder, the outside of the placement cylinder is provided with a mounting bracket fixed to the top surface of the workbench, the bottom surface of the mounting bracket is rotatably connected with a gear b, the gear a and the gear b are meshed together, and the top of the mounting bracket is provided with a rotating wheel fixed coaxially with the gear b.

[0012] In a preferred embodiment, the conical block, the adjusting cylinder, and the calibration sleeve are coaxially distributed, and the inner surfaces of the four elastic clamping blocks are arranged in a three-segment arc shape.

[0013] A method for controlling the accuracy of concentric reducers includes the following steps:

[0014] S1. Fitting and Positioning: After the sheet metal parts have been laid out, the large end of the sample to be welded is placed on the conical block and the part to be welded is aligned with the front end of the placement cylinder. The positioning mechanism forms a clamping and positioning process on the outer surface of the bottom of the sample, thus completing the initial placement and positioning of the bottom surface of the sample.

[0015] S2, Top Press Positioning: By pushing the electric push rod, the calibration sleeve at the bottom of the pressing plate is inserted into the small end of the sample, and the pressing plate is placed in close contact with the top surface of the sample end. The elastic clamping block elastically squeezes the top outer surface of the sample, thereby forming the top surface center calibration, top surface pressing positioning and outer surface elastic extrusion positioning treatment of the sample.

[0016] S3. Fine-tuning calibration: By fine-tuning the control mechanism, it expands outward from the inside of the sample, forming a squeezing and opening effect on the top inner surface of the sample, thus completing the fine-tuning and opening positioning treatment of the top inner surface of the sample, thereby forming a concentric control and positioning treatment of the large and small ends of the sample.

[0017] S4. Welding and forming: After welding one end of the sample that has been concentrically positioned in step S3, rotate the rotating wheel to make the placement cylinder rotate 180 degrees on the top surface of the worktable, so that the other end of the sample faces the front end of the worktable, and complete the welding process of the other part of the sample to be welded. By adjusting the control mechanism and the electric push rod in reverse in sequence, the welded sample can be taken out from the conical block and the positioning mechanism.

[0018] Compared with the prior art, the fixing device and fixing method for controlling the accuracy of concentric large and small heads provided by the present invention have at least the following beneficial effects:

[0019] (1) The two aligned samples are placed by the conical block and the bottom outer surface of the sample is squeezed and clamped by the positioning mechanism, thereby completing the concentric setting of the bottom large end of the sample and the conical block. By pushing the electric push rod, the elastic clamping block is elastically clamped to the top outer surface of the sample and the calibration sleeve is concentrically calibrated to the top center of the sample, thereby ensuring the concentric placement of the large end and small end of the sample and the conical block.

[0020] (2) By fine-tuning the control mechanism, the concentricity accuracy between the small head at the top of the sample and the calibration sleeve is further improved, which facilitates the subsequent welding of the sample. The concentricity control operation is simple and highly accurate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 For the present invention Figure 1Enlarged structural diagram of region A in the middle;

[0023] Figure 3 This is a partial structural diagram of the control mechanism of the present invention;

[0024] Figure 4 For the present invention Figure 3 Enlarged structural diagram of region B in the middle;

[0025] Figure 5 This is a partial structural diagram of the gear at point a according to the present invention;

[0026] Figure 6 For the present invention Figure 5 A magnified structural diagram of region C in the middle.

[0027] In the diagram: 1. Workbench; 2. Placement rack; 3. Placement cylinder; 4. Conical block; 5. Positioning mechanism; 51. Guide block; 52. Positioning rod; 53. Positioning block; 54. Positioning spring; 6. Electric push rod; 7. U-shaped frame; 8. Pressing plate; 9. Elastic clamping block; 10. Adjusting cylinder; 11. Calibration sleeve; 12. Control mechanism; 121. Fixing block; 122. Controlling block; 123. Through groove; 124. Slider; 125. Support spring; 126. Connecting rod; 127. Upright pole; 128. Pressing block; 129. Guide cylinder; 1210. Sliding sleeve; 1211. Pushing block; 1212. Mounting block; 1213. Adjusting bolt; 13. Supporting sleeve; 14. Gear a; 15. Mounting rack; 16. Gear b; 17. Rotating wheel. Detailed Implementation

[0028] The present invention will be further described below with reference to embodiments.

[0029] Please see Figure 1-6 This invention provides a fixing device for controlling the accuracy of concentric large and small heads, including a worktable 1, a placement frame 2 fixed on the top surface of the worktable 1, a placement cylinder 3 rotatably connected to the top surface of the worktable 1 below the placement frame 2, a conical block 4 fixed at the center of the placement cylinder 3, a positioning mechanism 5 located on the inner wall of the placement cylinder 3 around the conical block 4, an electric push rod 6 fixed to the bottom surface of the placement frame 2 above the conical block 4, a U-shaped frame 7 fixed at the output end of the electric push rod 6, a pressing plate 8 fixed at the bottom surface of the U-shaped frame 7, four symmetrically distributed elastic clamping blocks 9 fixed at the bottom surface of the pressing plate 8, an adjusting cylinder 10 fixedly penetrating the center of the pressing plate 8 between the four elastic clamping blocks 9, a calibration sleeve 11 fixed between the outer surface of the adjusting cylinder 10 and the bottom surface of the pressing plate 8, and an adjustment mechanism 12 between the pressing plate 8 and the adjusting cylinder 10.

[0030] Further as Figure 1 , Figure 2 and Figure 3As shown, it is worth noting that the positioning mechanism 5 includes four evenly distributed guide blocks 51. Each guide block 51 is fixed in contact with the inner wall of the placement cylinder 3. A positioning rod 52 slides through the guide block 51 and the placement cylinder 3. A positioning block 53 is fixed to the inner end of each of the four positioning rods 52. A positioning spring 54 is provided on the outer surface of the positioning rod 52 and is fixed to the opposite surface of the positioning block 53 and the guide block 51. The opposite surfaces of the four positioning blocks 53 are all arc-shaped, and the top surfaces of the four positioning blocks 53 are all chamfered.

[0031] Further as Figure 1 , Figure 4 , Figure 5 and Figure 6 As shown, it is worth noting that the control mechanism 12 includes a fixed block 121 fixed to the bottom surface of the regulating cylinder 10. Four symmetrically distributed control blocks 122 are rotatably connected to the top surface of the fixed block 121. Four symmetrically distributed through slots 123 are formed on the outer surface of the regulating cylinder 10. A slider 124, slidably connected to the inner wall of the regulating cylinder 10, is disposed between the four through slots 123. A support spring 125 is fixed to the opposite surface of the slider 124 and the fixed block 121. A connecting rod 126 is hinged between the outer surface of the slider 124 and the outer surface of the control block 122. A vertical rod 127 is fixed to the top surface of the slider 124, and a through-slot 126 is fixed to the top of the vertical rod 127. The pressing block 128 of 23 has a guide cylinder 129 fixed on the top surface of the pressing plate 8. The inner wall of the guide cylinder 129 is slidably connected to a sliding sleeve 1210. The outer surface of the sliding sleeve 1210 is fixed with a push block 1211 that cooperates with the pressing block 128. The outer end of the guide cylinder 129 is provided with a mounting block 1212 that is fixed to the top surface of the pressing plate 8. The inner wall of the mounting block 1212 is threaded through and extends into the sliding sleeve 1210. The vertical cross section of the push block 1211 is set in a right trapezoidal shape, and the vertical cross section of the pressing block 128 is set in a right triangle. The contact surface between the push block 1211 and the pressing block 128 is a matching inclined surface.

[0032] Further as Figure 1 , Figure 3 and Figure 5 As shown, it is worth noting that the bottom surface of the placement cylinder 3 is provided with a support sleeve 13 fixed to the top surface of the workbench 1. The inside of the support sleeve 13 is provided with a gear a14 fixed coaxially with the placement cylinder 3. The outside of the placement cylinder 3 is provided with a mounting bracket 15 fixed to the top surface of the workbench 1. The bottom surface of the mounting bracket 15 is rotatably connected with a gear b16. The gear a14 and the gear b16 are meshed together. The top of the mounting bracket 15 is provided with a rotating wheel 17 fixed coaxially with the gear b16.

[0033] A method for controlling the accuracy of concentric reducers includes the following steps:

[0034] S1. Fitting and positioning: After the sheet metal parts have been laid out, the large end of the sample to be welded is placed on the conical block 4 and the part to be welded is aligned with the front end of the placement cylinder 3. The positioning mechanism 5 forms a clamping and positioning process on the bottom outer surface of the sample, thus completing the initial placement and positioning of the bottom surface of the sample.

[0035] In actual operation, the two sheet metal parts are initially aligned and placed, and the bottom outer surface of the sample contacts and presses against the positioning block 53. Thus, through the elastic force of the positioning spring 54, the bottom outer surface of the sample is placed, pressed, and positioned.

[0036] S2, Top Press Positioning: By pushing the electric push rod 6, the calibration sleeve 11 at the bottom of the pressing plate 8 is inserted into the small end of the sample, and the pressing plate 8 is placed in close contact with the top surface of the sample end. The elastic clamping block 9 elastically squeezes the top outer surface of the sample, thereby forming the top surface center calibration, top surface pressing positioning and outer surface elastic squeezing positioning treatment of the sample.

[0037] In actual operation, the top outer surface and center of the sample are calibrated and positioned by the elastic clamping block 9 and the calibration sleeve 11, so that the elastic clamping block 9 can elastically clamp the sample and the calibration sleeve 11 and the sample can form a concentric top small head.

[0038] S3, Fine-tuning calibration: By fine-tuning the control mechanism 12, it expands outward from the inside of the sample, forming an expansion and compression on the top inner surface of the sample, thus completing the fine-tuning and positioning of the top inner surface of the sample, thereby forming a concentric control and positioning of the large and small ends of the sample.

[0039] In actual operation, by rotating the adjusting bolt 1213 on the mounting block 1212, the adjusting bolt 1213 drives the sliding sleeve 1210 to continuously push within the guide cylinder 129, thereby pushing the pushing block 1211 horizontally. Through the inclined surface of the pushing block 1211 and the pressing block 128, the pressing block 128, through the connection of the upright rod 127, causes the slider 124 to compress the supporting spring 125 downward within the adjusting cylinder 10. Through the transmission action of the connecting rod 126, the adjusting block 122 is distributed in an open shape on the top surface of the fixed block 121 until the top inner surface of the sample is compressed. Combined with the elastic clamping block 9 in step S2 clamping the top outer surface of the sample, the sample is placed more stably on the conical block 4, and the concentricity accuracy of its top small end is ensured simultaneously.

[0040] S4. Welding and Forming: After welding one end of the sample that has been concentrically positioned in step S3, rotate the rotating wheel to make the placement cylinder 3 rotate 180 degrees on the top surface of the worktable 1, so that the other end of the sample faces the front end of the worktable 1, completing the welding process for the other part of the sample to be welded. By sequentially adjusting the control mechanism 12 and the electric push rod 6 in the opposite direction, the welded sample can be removed from the conical block 4 and the positioning mechanism 5.

[0041] As can be seen from the above working process: the conical block 4 is used to place two aligned and assembled samples, and the positioning mechanism 5 is used to squeeze and clamp the bottom outer surface of the sample, thereby completing the concentric setting of the bottom large end of the sample and the conical block 4. The electric push rod 6 pushes the elastic clamping block 9 to elastically clamp the top outer surface of the sample, and the calibration sleeve 11 calibrates the concentricity of the top center of the sample, thereby ensuring the concentric placement of the large and small ends of the sample and the conical block 4. Finally, the fine-tuning of the adjustment mechanism 12 further improves the concentricity accuracy of the top small end of the sample and the calibration sleeve 11, thus facilitating the subsequent welding of the sample. The concentricity adjustment operation is simple and highly accurate.

[0042] Further as Figure 4 and Figure 5 As shown, it is worth noting that the conical block 4, the adjusting cylinder 10, and the calibration sleeve 11 are coaxially distributed. The inner surfaces of the four elastic clamping blocks 9 are arranged in a three-segment arc shape. The coaxial distribution of the conical block 4, the adjusting cylinder 10, and the calibration sleeve 11 facilitates the initial concentricity control of the sample when it is placed on the conical block 4. The shape of the elastic clamping block 9 facilitates the better entry of the top of the sample into the elastic clamping block 9 for elastic clamping during the pressing process of the pressing plate 8.

[0043] The electric linear actuator 6 can be purchased from the market. The electric linear actuator 6 is equipped with a power supply. It is a mature technology in this field and has been fully disclosed. Therefore, it will not be described again in the specification.

Claims

1. A fixture for controlling the accuracy of concentric sizing heads, comprising a worktable (1), characterized in that, The top surface of the workbench (1) is fixed with a rack (2), the lower portion of the rack (2) is provided with a rack cylinder (3) which is rotationally connected with the top surface of the workbench (1), the center of the rack cylinder (3) is fixed with a conical block (4), the outer periphery of the conical block (4) is provided with a positioning mechanism (5) which is located on the inner wall of the rack cylinder (3), the upper portion of the conical block (4) is provided with an electric push rod (6) which is fixed with the bottom surface of the rack (2), the output end of the electric push rod (6) is fixed with a U-shaped frame (7), the bottom surface of the U-shaped frame (7) is fixed with a pressing disc (8), the bottom surface of the pressing disc (8) is fixed with four elastic clamping blocks (9) which are symmetrically distributed, the four elastic clamping blocks (9) are provided with an adjusting cylinder (10) which penetrates through the center of the pressing disc (8), the outer surface of the adjusting cylinder (10) and the bottom surface of the pressing disc (8) are fixed with a calibration sleeve (11), the pressing disc (8) and the adjusting cylinder (10) are provided with a regulating mechanism (12). The positioning mechanism (5) comprises four guide blocks (51) which are uniformly distributed, each guide block (51) is fixedly connected with the inner wall of the rack cylinder (3), the guide block (51) and the rack cylinder (3) are slidably penetrated by a positioning rod (52), the inner end of the four positioning rods (52) is fixed with a positioning block (53), the outer surface of the positioning rod (52) is provided with a positioning spring (54) which is fixed with the opposite surface of the positioning block (53) and the guide block (51). The regulating mechanism (12) comprises a fixed block (121) which is fixed with the bottom surface of the adjusting cylinder (10), the top surface of the fixed block (121) is rotationally connected with four regulating blocks (122) which are symmetrically distributed, the outer surface of the adjusting cylinder (10) is provided with four through grooves (123) which are symmetrically distributed, the sliding block (124) which is slidably connected with the inner wall of the adjusting cylinder (10) is arranged between the four through grooves (123), the opposite surface of the sliding block (124) and the fixed block (121) is fixed with a supporting spring (125), the outer surface of the sliding block (124) and the outer surface of the regulating block (122) are hingedly connected with a connecting rod (126), the top surface of the sliding block (124) is fixed with a vertical rod (127), the top end of the vertical rod (127) is fixed with a pressing block (128) which penetrates through two through grooves (123), the top surface of the pressing disc (8) is fixed with a guide cylinder (129), the inner wall of the guide cylinder (129) is slidably connected with a sliding sleeve (1210), the outer surface of the sliding sleeve (1210) is fixed with a pushing block (1211) which cooperates with the pressing block (128), the outer end of the guide cylinder (129) is provided with a mounting block (1212) which is fixed with the top surface of the pressing disc (8), the inner wall of the mounting block (1212) is threadedly penetrated by a regulating bolt (1213) which extends into the sliding sleeve (1210). The vertical section of the pushing block (1211) is arranged in a right trapezoid shape, the vertical section of the pressing block (128) is arranged in a right triangle shape, and the contact surface of the pushing block (1211) and the pressing block (128) is a matching inclined surface.

2. A fixture for controlling the accuracy of concentric sizing heads according to claim 1, characterized in that: Opposite surfaces of the four positioning blocks (53) are arranged in arc surfaces, and top surfaces of the four positioning blocks (53) are provided with chamfers.

3. A fixture for controlling the accuracy of concentric sizing heads according to claim 1, wherein: The bottom surface of the placing cylinder (3) is provided with a support sleeve (13) fixed to the top surface of the workbench (1), the inside of the support sleeve (13) is provided with a gear a (14) fixed coaxially with the placing cylinder (3), the outside of the placing cylinder (3) is provided with a mounting frame (15) fixed to the top surface of the workbench (1), the bottom surface of the mounting frame (15) is rotationally connected with a gear b (16), the gear a (14) and the gear b (16) are in meshing connection, and the top of the mounting frame (15) is provided with a rotating wheel (17) fixed coaxially with the gear b (16).

4. A fixture for controlling the accuracy of concentric sizing heads according to claim 1, wherein: The conical block (4), the adjusting cylinder (10) and the calibration sleeve (11) are coaxially arranged, and the inner surfaces of the four elastic clamping blocks (9) are arranged in three-section arc surfaces.

5. A method of securing a fixture for controlling the accuracy of a concentric reducer according to any one of claims 1-4, characterized in that, The method comprises the following steps: S1, placing and positioning: the sheet metal part processed by lofting is subjected to preliminary alignment and placement, the large end of the to-be-welded sample is placed on the conical block (4), and the to-be-welded part is aligned with the front end of the placing cylinder (3), the clamping and positioning of the outer surface of the bottom of the sample are formed by the positioning mechanism (5), and the preliminary placement and positioning of the bottom of the sample are completed; S2, top pressing positioning: the calibration sleeve (11) at the bottom end of the pressing disc (8) is pushed into the small end of the sample by the electric push rod (6), and the pressing disc (8) is placed in close contact with the top surface of the sample, and the elastic clamping block (9) elastically extrudes the top outer surface of the sample, so that the center calibration, top pressing positioning and outer surface elastic extrusion positioning of the top surface of the sample are formed; S3, fine adjustment and calibration: the adjusting mechanism (12) is fine adjusted to expand outward from the inside of the sample, the inside surface of the top of the sample is expanded and extruded, the fine adjustment and positioning of the inside surface of the top of the sample are completed, and the concentric adjustment and positioning of the large and small ends of the sample are formed; S4, welding forming: after one end of the sample positioned concentrically in step S3 is welded, the placing cylinder (3) is rotated by one hundred and eighty degrees on the top surface of the workbench (1), the other end of the sample is directed to the front end of the workbench (1), the welding of the other to-be-welded part of the sample is completed, and the welded sample is taken out from the conical block (4) and the positioning mechanism (5) by reverse adjustment of the adjusting mechanism (12) and the electric push rod (6).

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