Mass flow meter measuring pipe bending tool and machining method

Abstract

The invention discloses a mass flow meter measuring pipe bending tool and a machining method, and relates to the technical field of mass flow meter measuring pipes, the pipe bending tool comprises a base, a main body pipe bending module and an end part pipe bending module, the main body pipe bending module comprises a main body pipe bending mold, the side wall of the main body pipe bending mold is provided with a main body guide groove, the main body pipe bending mold is in a triangular prism shape, and the end part pipe bending module is connected with the main body guide groove; a first side edge and a second side edge of the main body pipe bending die are provided with fillets, a third side edge of the main body pipe bending die is provided with a chamfer, and the edge of the chamfer is subjected to smooth treatment; the end part pipe bending module comprises an end part pipe bending mold and an end part guide groove; the processing method comprises the following steps: bending the measuring pipe main body by utilizing the main body pipe bending module, and respectively bending elbows at two ends of the measuring pipe main body by utilizing the two end part pipe bending modules. The whole pipe can be bent into a product at a time through the pipe bending tool, the pipe bending tool is suitable for machining of a single-layer double-pipe bent pipe, and the production cost is low; and the product has no joint, and has the advantages of smaller pressure loss, higher pressure grade and higher metering precision.

Description

Technical Field

[0001] The invention relates to the technical field of mass flow meter measuring tubes, and in particular to a mass flow meter measuring tube bending tool and a processing method. Background Art

[0002] The number of measuring tubes of Coriolis mass flowmeters can be single tube, double tube, or multiple tubes. At present, the most widely used and most mature technology should be double tube flowmeters, which usually use double tubes in parallel, and use the split flow to split the fluid into two tubes and then merge them. In order to improve product performance, a new double tube design is now available, which is adjusted from the traditional split flow double tube structure to a single tube double-layer curved tube structure, such as Figure 1 As shown. This structure can effectively reduce the calibration coefficient of the mass flow meter and improve the metering accuracy. The calibration coefficient of the same tube shape using the split-fluid double-tube structure is twice that of the single-tube double-layer elbow structure; it can effectively reduce pressure loss. In the split-fluid double-tube structure, the fluid needs to be split and converged at the front and rear ends of the measuring tube, which is bound to produce a certain pressure loss. The single-tube double-layer elbow uses a single pipeline to replace the split fluid, and there is no split and convergence process, thereby reducing pressure loss. Because the mass flow meter has high requirements for the consistency of the double-tube shape, the bending process of the single-tube double-layer elbow plays a vital role in the product quality, but there is currently no tooling and processing method suitable for single-tube double-layer elbows. Summary of the invention

[0003] In view of the problem that there is no tooling and processing method suitable for single-tube double-layer bending in the prior art, the present invention provides a mass flowmeter measuring tube bending tooling and processing method.

[0004] The present invention provides the following technical solutions: a mass flow meter measuring tube bending tool, comprising a base and a main body bending module and an end bending module detachably connected to the base; The main body bending module comprises a main body bending mold, and the side wall of the main body bending mold is provided with a main body guide groove; the main body bending mold is in the shape of a triangular prism, and the first side edge and the second side edge of the main body bending mold are provided with rounded corners, and the third side edge is provided with a chamfer, and the chamfered edge is rounded; the main body guide groove comprises an upper guide groove and a lower guide groove arranged in parallel, and the upper guide groove is connected with the lower guide groove at the chamfer; the side wall of the main body bending mold is detachably connected with a plurality of pressing plates corresponding to the upper guide groove and the lower guide groove respectively; The two end bending modules are respectively arranged on both sides of the main bending module, and the end bending module includes an end bending mold. One side edge of the end bending mold is provided with a rounded corner, and the rounded corner and the side walls on both sides of the rounded corner are provided with end guide grooves, and the side wall on one side of the rounded corner is detachably connected to a pressure plate corresponding to the end guide groove.

[0005] Preferably, the fillets of the main tube bending mold and the end tube bending mold are rotatably connected to a crank, the crank is rotatably connected to a tube bending wheel, and the tube bending wheel rotates around the fillet; the tube bending wheel and the crank are detachably connected.

[0006] Preferably, the tube bending wheels located on the two rounded corners of the main tube bending mold are provided with two positioning grooves corresponding to the upper guide groove and the lower guide groove respectively.

[0007] Preferably, the crank is also provided with a driving rod.

[0008] Preferably, the chamfer of the main tube bending mold is detachably connected to an end fixing frame, the end fixing frame is provided with two supporting legs, and the supporting legs are detachably connected to a pressing plate.

[0009] Preferably, the two end bending molds are symmetrical about the central axis of the base.

[0010] A method for processing a mass flow meter measuring tube comprises the following steps: Step 1, placing a straight tube cut to a preset length in an upper guide groove or a lower guide groove of a side wall of a main tube bending mold, and fixing it with a pressing plate; bending the straight tube in sequence along the main guide groove, fixing it with a pressing plate after each elbow is bent, until all elbows of the measuring tube main body are bent, the measuring tube main body is formed, and then the main tube bending mold is removed; Step 2, placing the straight tube at one end of the measuring tube body into an end guide groove of an end bending module and fixing it with a pressing plate, then bending the upper end along the end guide groove, inserting the straight tube into the end guide groove, and then removing the measuring tube; Step 3, place the straight tube at the other end of the measuring tube body into the end guide groove of another end bending module and fix it with a pressing plate, then bend the lower end along the end guide groove, insert the straight tube into the end guide groove, remove the measuring tube, and the bending is completed.

[0011] Preferably, in steps 1, 2 and 3, a tube bending wheel is mounted on the main tube bending die, and the tube bending wheel is rotated to bend the measuring tube.

[0012] Preferably, the method further comprises step 4 of installing an end fixing frame on the main tube bending mold, and fixing the upper layer end and the lower layer end to the end fixing frame by means of a pressing plate.

[0013] The beneficial effects of the present invention are as follows: the entire pipe can be bent into a product at one time by using the main pipe bending module and the two end pipe bending modules, which is suitable for the processing of single-layer double-tube bending and has low production cost; the product has no joints, has the advantages of smaller pressure loss, higher pressure level, and higher metering accuracy, and is more conducive to the pairing of measuring pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of a single-tube double-layer elbow.

[0015] Figure 2 It is a three-dimensional schematic diagram of an embodiment of a pipe bending tool.

[0016] Figure 3 It is a schematic diagram of an embodiment of a main bending pipe module.

[0017] Figure 4 A schematic diagram of an embodiment of an end elbow module.

[0018] Figure 5 A side view of an embodiment of a pipe bending tool.

[0019] Figure 6 for Figure 5 AA cross-section diagram.

[0020] 1. the upper pipe bending module; 2. the lower pipe bending wheel; 3. the lower pipe bending wheel; 4. the lower pipe bending wheel; 5. the lower pipe bending wheel; 6. the measuring tube body; 7. the upper pipe; 8. the first upper elbow; 9. the second upper elbow; 10. the lower pipe; 11. the first lower elbow; 12. the second lower elbow; 13. the third lower pipe; 14. the connecting piece; 15. the upper pipe; 16. the first lower elbow; 17. the second lower elbow; 18. the lower pipe; 19. the first lower elbow; 20. the lower pipe; 21. the second lower elbow; 22. the upper pipe; 23. the lower pipe; 24. the inclined pipe; 25. the end fixing frame; 251. the supporting leg; 30. the end pipe bending module; 31. the end pipe bending mold; 32. the end guide groove; 40. the pressing plate; 51. the crank; 52. the pipe bending wheel; 53. the positioning groove; 54. the driving rod; 61. the measuring tube body; 611. the upper pipe; 6111. the first upper elbow; 6112. the second upper elbow; 612. the lower pipe; 6121. the first lower elbow; 6122. the second lower elbow; 613. the inclined pipe; 62. the upper end; 63. the lower end. DETAILED DESCRIPTION

[0021] The following is a more detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and the accompanying drawings so that a person skilled in the art can implement the embodiments after reading the description. 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. Example

[0022] The present invention provides a mass flow meter measuring tube bending tool for processing a single-tube double-layer bent tube. Figure 1The single-tube double-layer elbow comprises a measuring tube body 61, an upper layer end 62 and a lower layer end 63. The measuring tube body 61 comprises an upper layer pipe 611 and a lower layer pipe 612 arranged in parallel and an inclined pipe 613 connected between the upper layer pipe 611 and the lower layer pipe 612. One end of the upper layer pipe 611 is connected to the upper layer end 62, and one end of the lower layer pipe 612 is connected to the lower layer end 63. The length and shape of the upper layer pipe 611 and the lower layer pipe 612 are consistent, and the overall structure is a triangular structure. The upper layer pipe 611 has a first upper layer elbow 6111 and a second upper layer elbow 6112, and the lower layer pipe 612 includes a first lower layer elbow 6121 and a second lower layer elbow 6122; the upper layer end 62 and the lower layer end 63 each have an elbow. In order to reduce the calibration coefficient of the mass flowmeter, improve the metering accuracy, and reduce the pressure loss, the single-tube double-layer elbow needs to be bent from a whole pipe.

[0023] The pipe bending tool comprises a base 10, a main pipe bending module 20 and two end pipe bending modules 30 detachably connected to the base 10. The main pipe bending module 20 is used to bend the measuring pipe body 61, and the two end pipe bending modules 30 are used to bend the upper end 62 and the lower end 63 respectively, and their specific sizes are designed according to the actual product requirements.

[0024] Please refer to Figure 2 , 3 The main body bending module 20 includes a main body bending mold 21, which is in the shape of a triangular prism as a whole, including a first bending part 211, a second bending part 212, a third bending part 213 connected between the first and second bending parts, and a connecting part 214, which are connected by bolts after being spliced. The first bending part 211 and the second bending part 212 correspond to the first side edge and the second side edge of the main body bending mold 21, respectively, and are provided with rounded corners to facilitate bending the four elbows of the measuring tube body 61; the third bending part 213 corresponds to the third side edge of the main body bending mold 21, and is provided with a chamfer, and the chamfer and the side walls on both sides are rounded to facilitate bending the inclined tube 613.

[0025] The side wall of the main pipe bending mold 21 is also provided with a main guide groove, which cooperates with the pipe to be bent and plays a role in limiting and guiding the pipe during the bending process. Specifically, the main guide groove includes an upper guide groove 22 and a lower guide groove 23 arranged in parallel, the upper and lower guide grooves are consistent in length and shape, and the upper guide groove 22 and the lower guide groove 23 are connected at the chamfer through an inclined groove 24, and the bending of the inclined pipe 613 is completed at the inclined groove 24. The side wall of the main pipe bending mold 21 is bolted with a plurality of pressing plates 40 corresponding to the upper guide groove 22 and the lower guide groove 23, respectively, and the pressing plate 40 is provided with a groove that cooperates with the pipe to be bent on the side facing the main guide groove to fix the straight part of the measuring tube body 61, so as to facilitate the pressing of the elbow.

[0026] Please refer to Figure 2 , 4 The two end bending modules 30 are respectively arranged on both sides of the main bending module 20, and the end bending module 30 includes an end bending mold 31, and one side edge of the end bending mold 31 is provided with a rounded corner, and the rounded corner and the side walls on both sides of the rounded corner are provided with end guide grooves 32. The two end guide grooves 32 are respectively matched with the upper end 62 and the lower end 63, and are respectively used to bend the upper end 62 and the lower end 63; specifically, the two end bending molds 31 are symmetrical about the central axis of the base, but the two end guide grooves 32 are asymmetrical about the central axis of the base, and the extension directions of the bent pipes are inconsistent. Similarly, the side wall on one side of the rounded corner is bolted with a pressure plate 40 corresponding to the end guide groove 32, and the pressure plate 40 is provided with a groove that matches the pipe to be bent toward the side of the main guide groove to fix the straight part of the pipe.

[0027] Furthermore, the fillets of the main tube bending die 21 and the end tube bending die 31 are both rotatably connected to a crank 51, and the crank 51 is detachably connected to a tube bending wheel 52, and the tube bending wheel 52 rotates around the fillet. The crank 51 is also provided with a driving rod 54, and the tube bending wheel 52 is driven to rotate by pressing the driving rod 54, so as to bend the pipe sandwiched between the tube bending wheel and the fillet.

[0028] Please refer to Figure 5 , 6 In the main tube bending module 20, the tube bending wheel 52 located on the two fillets of the main tube bending mold 21 is provided with two positioning grooves 53 corresponding to the upper guide groove 22 and the lower guide groove 23 respectively; the crankshaft center axis of the crank 51 is collinear with the center axis of the fillet, the rotation axis of the tube bending wheel 52 is parallel to the crankshaft center axis, and a certain distance is left between the tube bending wheel and the fillet. In the end tube bending module 30, due to the change in height of the end guide groove, the surface of the tube bending wheel is not provided with a groove that matches the pipe, but a certain distance is left between the tube bending wheel and the fillet.

[0029] Please refer to Figure 2 The chamfer of the main bending tube mold 21 can be detachably connected with an end fixing frame 25, and the end fixing frame 25 is provided with two legs 251, and the legs 251 are detachably connected with a pressing plate 40. After the measuring tube is bent, the ends of the upper end 62 and the lower end 63 are respectively fixed on the two legs 251 for a period of time by the pressing plate 40 to prevent rebound. Example

[0030] The present invention provides a method for processing a mass flow meter measuring tube, and uses the tube bending tool provided in Example 1 to complete the bending of a single-tube double-layer tube at one time.

[0031] The processing method comprises the following steps.

[0032] Step 1, first, place the straight tube cut to a preset length in the upper guide groove 22 of one side wall of the main tube bending mold 21, leaving enough length at both ends, and then use the pressing plate 40 to fix the straight tube on the side wall, and install the tube bending wheel so that the straight tube is between the tube bending wheel and the main tube bending mold 21; secondly, press the driving rod 54 to drive the tube bending wheel to rotate around the center of the fillet, bend the straight tube along the upper guide groove 22, form the first upper elbow 6111, and fix it with the pressing plate 40, and then install another elbow The tube wheel 52 places the straight tube between another tube bending wheel and the main tube bending mold 21, and uses the tube bending wheel to bend the straight tube along the upper guide groove 22 to form a second upper elbow 6112, and fix it with a pressing plate, and remove the two tube bending wheels; then, manually complete the bending and fixing of the inclined tube 613 at the inclined groove 24, and complete the bending of the first lower elbow 6121 and the second lower elbow 6122 in the above manner, measure the tube body 61, and remove it from the base together with the main tube bending module 20.

[0033] Step 2, place the straight tube at one end of the measuring tube body 61 in the end guide groove 32 of an end bending module 30, fix it with the pressure plate 40, then install the bending wheel on the end bending mold 31, rotate the bending wheel 52 to bend the upper end 62 along the end guide groove 32, and completely insert the straight tube into the end guide groove 32. After bending, remove the measuring tube.

[0034] Step 3, place the straight tube at the other end of the measuring tube body 61 in the end guide groove 32 of another end bending module, fix it with the pressing plate 40, then install the bending wheel on the end bending mold 31, rotate the bending wheel 52 to bend the lower end 63 along the end guide groove 32, and completely insert the straight tube into the end guide groove 32. After the bending is completed, remove the measuring tube and the bending is completed.

[0035] Step 4, install the end fixing frame 25 on the main tube bending mold 21, and fix the ends of the upper end 62 and the lower end 63 to the two legs 251 respectively by using the pressing plate 40, and maintain them for a period of time to prevent rebound.

[0036] The above are one or more embodiments of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A mass flow meter measuring tube bending tool, characterized in that: It comprises a base and a main body bending pipe module and an end bending pipe module detachably connected to the base; The main body bending module comprises a main body bending mold, and the side wall of the main body bending mold is provided with a main body guide groove; the main body bending mold is in the shape of a triangular prism, and the first side edge and the second side edge of the main body bending mold are provided with rounded corners, and the third side edge is provided with a chamfer, and the chamfered edge is rounded; the main body guide groove comprises an upper guide groove and a lower guide groove arranged in parallel, and the upper guide groove is connected with the lower guide groove at the chamfer; the side wall of the main body bending mold is detachably connected with a plurality of pressing plates corresponding to the upper guide groove and the lower guide groove respectively; The two end bending modules are respectively arranged on both sides of the main bending module, and the end bending module includes an end bending mold. One side edge of the end bending mold is provided with a rounded corner, and the rounded corner and the side walls on both sides of the rounded corner are provided with end guide grooves, and the side wall on one side of the rounded corner is detachably connected to a pressure plate corresponding to the end guide groove.

2. A mass flow meter measuring tube bending tool according to claim 1, characterized in that: The fillets of the main tube bending mold and the end tube bending mold are both rotatably connected to a crank, and the crank is rotatably connected to a tube bending wheel, and the tube bending wheel rotates around the fillets; the tube bending wheel is detachably connected to the crank.

3. A mass flow meter measuring tube bending tool according to claim 2, characterized in that: The pipe bending wheels located on the two rounded corners of the main pipe bending mold are provided with two positioning grooves corresponding to the upper guide groove and the lower guide groove respectively.

4. A mass flow meter measuring tube bending tool according to claim 2, characterized in that: The crank is also provided with a driving rod.

5. The mass flow meter measuring tube bending tool according to claim 1, characterized in that: The chamfer of the main pipe bending mold can be detachably connected to an end fixing frame, and the end fixing frame is provided with two supporting legs, and the supporting legs are detachably connected to a pressing plate.

6. A mass flow meter measuring tube bending tool according to claim 1, characterized in that: The two end tube bending dies are symmetrical about the central axis of the base.

7. A method for processing a mass flow meter measuring tube, characterized in that: The following steps are involved: Step 1, placing a straight tube cut to a preset length in an upper guide groove or a lower guide groove of a side wall of a main tube bending mold, and fixing it with a pressing plate; bending the straight tube in sequence along the main guide groove, fixing it with a pressing plate after each elbow is bent, until all elbows of the measuring tube main body are bent, the measuring tube main body is formed, and then the main tube bending mold is removed; Step 2, placing the straight tube at one end of the measuring tube body into an end guide groove of an end bending module and fixing it with a pressing plate, then bending the upper end along the end guide groove, inserting the straight tube into the end guide groove, and then removing the measuring tube; Step 3, place the straight tube at the other end of the measuring tube body into the end guide groove of another end bending module and fix it with a pressing plate, then bend the lower end along the end guide groove, insert the straight tube into the end guide groove, remove the measuring tube, and the bending is completed.

8. The method for processing a mass flow meter measuring tube according to claim 7, characterized in that: In steps 1, 2 and 3, the pipe bending wheel is installed on the main pipe bending mold, and the pipe bending wheel is rotated to bend the measuring pipe.

9. The method for processing a mass flow meter measuring tube according to claim 7, characterized in that: The method further comprises step 4, wherein an end fixing frame is installed on the main tube bending mold, and an upper layer end and a lower layer end are fixed on the end fixing frame by using a pressing plate.

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