Pipe fitting bending device
By designing a pipe bending device, the problems of low productivity and poor consistency in pipe bending forming in the existing technology have been solved. High-precision pipe bending forming has been achieved, which is suitable for stable bending of large arcs and small arc radii, and meets the needs of mass production.
Patent Information
- Application Number
- CN202520019058.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-06
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-06
AI Technical Summary
In existing technologies, pipe bending forming suffers from low productivity, poor consistency, and high requirements for production personnel, making it impossible to meet the needs of mass production. Furthermore, it is prone to internal wall scratches and production difficulties caused by excessively large mold sizes.
A pipe bending device was designed, including an upper base plate, a lower base plate, a concave die assembly and a convex die assembly, which are connected by guide pillars and guide sleeves to avoid the use of mandrels. A detachable insert mold and an ejection mechanism are used to ensure the stability and forming accuracy of the pipe during the bending process.
It achieves high-precision pipe bending and forming with a roundness of over 98%, avoiding production difficulties caused by inner wall scratches and excessively large mold size. It is suitable for stable bending of pipes with large and small arc radii, meeting the requirements of mass production.
Smart Images
Figure CN223733610U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to pipe material bending technology field, concretely is a pipe fitting bending device. BACKGROUND
[0002] In chemical, pharmaceutical and other industrial fields, the flow of fluid in the pipeline is very important for monitoring and controlling the production process. The flow of fluid in the pipeline is usually measured by flow meter. The flow meters commonly used in closed pipeline system can be divided into electromagnetic flow meter, ultrasonic flow meter, matrix flow meter and Coriolis mass flow meter. Among them, Coriolis mass flow meter is an instrument that can directly and accurately detect the mass flow of fluid in the pipeline by using the Coriolis principle that the fluid flowing in the vibrating pipeline generates a flow proportional to its own mass. Coriolis mass flow meter can be used for measuring various fluids, such as gas, liquid, high viscosity fluid and paste medium. Moreover, the measurement principle of Coriolis mass flow meter is independent of the physical properties of the fluid, and is not affected by the changes of fluid pressure, density and temperature.
[0003] The measuring tube is one of the most important components of the mass flow meter, and its design and processing precision directly affects the accuracy and stability of the entire equipment. The current mainstream measuring tube forming method is cold bending forming. However, the inner wall of the tube is prone to wrinkling due to instability during bending operation, and the outer wall of the tube is prone to cracking and distortion of the cross-sectional shape at the bending part, which affects the bending forming quality of the tube. The recognized technology for pipe bending in the past is bending: bending is to press a straight pipe on a bending die with a predetermined curvature, and bend the straight pipe around a certain center under the action of external force. Most of the bending does not require special bending equipment, the processing cost is low, and the adjustment and use are convenient. However, because there is no special bending equipment, the production rate is low, the consistency of the bent pipe is poor, the requirements for production related personnel are too high, and it cannot meet the requirements of batch production. Therefore, a pipe fitting bending device is designed to solve the above problems, which has the advantages of stable bending of large arc radius, avoiding damage to the inner wall caused by implanting a core rod, and avoiding the phenomenon of production difficulty caused by the large size of the mold required for bending pipe. SUMMARY
[0004] (I) Technical problems solved
[0005] In view of the shortcomings of the prior art, the utility model provides a pipe fitting bending device, which has the advantages of stable bending of large arc radius, avoiding damage to the inner wall caused by implanting a core rod, and avoiding the phenomenon of production difficulty caused by the large size of the mold required for bending pipe. The problems of low production rate of bending, poor consistency of bent pipe, high requirements for production related personnel, and inability to meet the requirements of batch production are solved.
[0006] (II) Technical scheme
[0007] In order to realize the above-mentioned stable bending of large radius of circle, avoid the scratch of inner wall caused by inserting the mandrel and avoid the phenomenon of production difficulty caused by the oversize of the die required for bending pipe, the utility model provides the following technical scheme: a pipe fitting bending device, which comprises an upper bottom plate and a lower bottom plate, and a die assembly is arranged on the upper side of the lower bottom plate, the die assembly is arranged on the upper side of the lower bottom plate, and an ejection block is arranged in the die assembly, a punch assembly is arranged on the lower side of the upper bottom plate, and a middle punch assembly is arranged in the punch assembly, guide columns and guide sleeves are arranged between the upper bottom plate and the lower bottom plate, and the two ends of the guide columns and guide sleeves are fixedly connected with the lower side of the upper bottom plate and the upper side of the lower bottom plate respectively, and a pipe body is arranged between the die assembly and the punch assembly.
[0008] Preferably, the die assembly comprises a left die assembly and a right die assembly, the left die assembly and the right die assembly are arranged at the two ends of the upper side of the lower bottom plate respectively, the ejection block is arranged between the left die assembly and the right die assembly, and the two sides of the ejection block are slidably connected with the left die assembly and the right die assembly respectively, and the pipe body is arranged on the upper side of the left die assembly and the right die assembly.
[0009] Preferably, the punch assembly comprises a left punch assembly and a right punch assembly, the left punch assembly and the right punch assembly are arranged at the two ends of the lower side of the upper bottom plate respectively, the middle punch assembly is arranged between the left punch assembly and the right punch assembly, and the two sides of the middle punch assembly are fixedly connected with one side of the left punch assembly and the right punch assembly respectively.
[0010] Preferably, a positioning pin is arranged between the left punch assembly and the upper bottom plate, one end of the positioning pin is arranged in the upper bottom plate, and the left punch assembly is arranged on the outer side of the positioning pin.
[0011] Preferably, a sliding baffle is fixedly arranged on one side of the left die assembly, one side of the sliding baffle is slidably connected with one side of the left punch assembly, one end of the pipe body is in close contact with one side of the sliding baffle, and fittings are arranged at the two ends of the pipe body.
[0012] Preferably, a T-shaped supporting rod is arranged between the ejection block and the lower bottom plate, and one end of the T-shaped supporting rod is arranged on the inner wall of the lower bottom plate.
[0013] (Three)beneficial effects
[0014] Compared with the prior art, the pipe bending device has the following beneficial effects: the pipe bending device forms an almost incompressible forming body inside the initial pipe material to be bent, so that the circular cross-sectional shape is very stable during bending, and the roundness of the formed pipe is very high, which can reach more than 98%, and the pipe material with a bending radius of less than 1 can be bent, and the pipe material with a large arc radius can also be bent, and the damage or scratch of the inner pipe wall caused by the metal mandrel can be avoided to the greatest extent.
[0015] Since the paraffin used is flowable before and after bending, the iron sand and the paraffin are easy to enter the initial pipe material, and easy to separate from the formed measuring pipe;
[0016] Moreover, the concave die and the convex die of the mold are combined and installed by separately processed inserts and are provided with an ejection mechanism, so that the difficulty in production caused by the oversize of the mold required for bending the pipe material is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is a sectional view of the mold closing state structure of the utility model;
[0018] Figure 2 It is a pipe material installation structure diagram of the mold opening state of the utility model;
[0019] Figure 3 It is a mold closing state structure diagram of the utility model;
[0020] Figure 4 It is a forming structure diagram of the mold after closing and opening of the utility model;
[0021] Figure 5 It is a sectional view of the pipe body before and after bending of the utility model.
[0022] In the drawing: 1, pipe body; 3, fitting; 4, upper bottom plate; 5, positioning pin; 6, middle convex die assembly; 7, right convex die assembly; 8, guide column guide sleeve; 9, lower bottom plate; 10, right concave die assembly; 11, ejection block; 12, T-shaped supporting rod; 13, left concave die assembly; 14, sliding baffle; 15, left convex die assembly. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.
[0024] Embodiment: Please refer to Figures 1-5The utility model provides a kind of pipe bending device, including upper bottom plate 4 and lower bottom plate 9, and the upper side of lower bottom plate 9 is equipped with die assembly, die assembly is installed on the upper side of lower bottom plate 9, and the inside of die assembly is equipped with knockout block 11, the lower side of upper bottom plate 4 is equipped with male die assembly, and the inside of male die assembly is equipped with middle male die assembly 6, guide pillar guide sleeve 8 is installed between upper bottom plate 4 and lower bottom plate 9, and the both ends of guide pillar guide sleeve 8 are fixedly connected with the lower side of upper bottom plate 4 and the upper side of lower bottom plate 9 respectively, and pipe body 1 is arranged between die assembly and male die assembly.Die assembly includes left die assembly 13 and right die assembly 10, and left die assembly 13 and right die assembly 10 are respectively installed on the both ends of the upper side of lower bottom plate 9, knockout block 11 is installed between left die assembly 13 and right die assembly 10, and the both sides of knockout block 11 are slidably connected with corresponding left die assembly 13 and right die assembly 10 respectively, and pipe body 1 is installed on the upper side of left die assembly 13 and right die assembly 10.Male die assembly includes left male die assembly 15 and right male die assembly 7, and left male die assembly 15 and right male die assembly 7 are respectively installed on the both ends of the lower side of upper bottom plate 4, and middle male die assembly 6 is installed between left male die assembly 15 and right male die assembly 7, and the both sides of middle male die assembly 6 are fixedly connected with one side of corresponding left male die assembly 15 and right male die assembly 7 respectively.Positioning pin 5 is installed between left male die assembly 15 and upper bottom plate 4, and one end of positioning pin 5 is arranged in the inside of upper bottom plate 4, and left male die assembly 15 is installed on the outside of positioning pin 5.One side of left die assembly 13 is fixedly installed with sliding baffle 14, and one side of sliding baffle 14 is slidably connected with one side of left male die assembly 15, one end of pipe body 1 is in close contact with one side of sliding baffle 14, and accessory 3 is installed at the both ends of pipe body 1.T-shaped supporting rod 12 is installed between knockout block 11 and lower bottom plate 9, and one end of T-shaped supporting rod 12 is arranged on the inner wall of lower bottom plate 9.
[0025] Wherein, the initial pipe body 1 is cut into the desired length of the annealed pipe, and the desired length is longer than Figure 1 The horizontal straight length of the concave-convex die of the forging die is slightly longer, which makes the composition 2 at the end of the unsealed side of the initial pipe body 1 still have high strength during the forging forming process, and the longer the straight pipe segment is, the more it can avoid local wrinkling of the pipe fitting. Figure 5 The tight composition 2 formed by using iron sand and paraffin as filling materials is used to stabilize the shape of the cross section, and before pouring the iron sand and paraffin in a certain order and proportion, an elastic high-temperature-resistant conical plug is first inserted into the pipe, and a rubber hammer or other tools are used to make the plug completely embedded, and then the combination part of the plug and the initial pipe is covered and compacted with raw material belt, special high-temperature-resistant fresh-keeping film, high-temperature-resistant adhesive tape and other accessories in sequence, so as to achieve the purpose of completely sealing one end of the pipe, and then the sealed end is placed downward.
[0026] The first filling material is paraffin wax, which is used because it is in a solid state at room temperature and melts into a liquid at a temperature lower than the melting temperature of the initial pipe material 316L, referred to as a solidified liquid. The second filling material is iron sand, which is in a solid state at room temperature and is in a pourable state, generally in the form of spherical particles or powder, and has a melting temperature higher than that of paraffin wax. In order to achieve the best filling effect, the diameter of the iron sand particles will change according to the initial pipe diameter.
[0027] During the filling process, the iron sand and small particles of solid paraffin wax are loaded into the pipe in a certain proportion and order of paraffin wax particles first and then iron sand, alternating filling, and a certain frequency of vibration or shaking is applied to promote further densification and thus enhance the strength of the composite 2. The filling is completed until the unsealed end of the vertically placed initial pipe body 1 is filled, and the paraffin wax is placed in a high and low temperature box to allow it to be in a melting temperature environment. The use of gravity and a certain frequency of mechanical vibration allows the two to mix thoroughly.
[0028] After the initial pipe body 1 is fully filled with iron sand and paraffin wax, as shown in Figure 5 , it is placed in an outdoor environment to allow the paraffin wax to solidify in the initial pipe body 1.
[0029] Figure 1 The mold closing state is shown schematically: including the upper base plate 4, the positioning pin 5, the middle punch assembly 6, the right punch assembly 7, the guide column guide sleeve 8, the lower base plate 9, the right recess assembly 10, the ejector block 11, the T-shaped support rod 12, the left recess assembly 13, the sliding baffle 14 and the left punch assembly 15. The left punch assembly 15, the middle punch assembly 6 and the right punch assembly 7 form the punch, the right recess assembly 10, the ejector block 11 and the left recess assembly 13 form the recess, and the punch combination and the recess combination both have a semicircular groove with a diameter equal to the outer diameter of the initial pipe body 1. When the mold is closed, the combined circular groove profile of the punch combination and the recess combination is the desired outer profile of the un-naturally rebounded curved pipe body 1, and the positioning pin 5 ensures the correct installation of the punch assembly and the upper base plate. The guide column guide sleeve 8 regulates the up and down travel of the mold during the bending process.
[0030] After the mold is opened, the initial pipe body 1 of Figure 5 is placed in the correct position of the bending mold, and the sliding baffle 14 is used to limit the position of the unsealed end of the initial pipe 1 on the left side, thereby effectively controlling the consistency of the batch of bent pipes. Using the power of the crank press, the relative movement of the punch combination and the recess combination is used to Figure 1The press bending mold is in the closed state and is kept for a period of time to correct the bending and bend the desired outer contour of the bent measuring tube 1 without natural rebound; finally, the upper mold is raised, the mold is in the open state, the ejection mechanism composed of the ejection block 11 and the T-shaped supporting rod 12 ejects the measuring tube from the half-round groove of the concave mold combination, which is convenient for subsequent removal of the pipe body 1. Figure 5 The bent pipe body 1 that is bent and rebounded is placed in a temperature environment where paraffin is melted, the paraffin is fully melted, the filling material in the measuring tube 1 is removed, and the pipe body 1 is obtained. Here, water bath heating or heating by adding an organic solvent is often used to speed up the above cleaning process and can promote the complete separation of the two filling materials from the inner wall of the tube. Subsequently, other accessories 3 such as the tapered plug and the raw material belt are removed, and the desired measuring tube is obtained by using an electric spark cutting method, without additional post-processing, and can be used in a Coriolis mass flowmeter.
Claims
1. A tube bending apparatus, characterized by: The utility model provides a pipe body (1) is arranged between the concave die assembly and the convex die assembly, the pipe body (1) is installed on the upper side of the left concave die assembly (13) and the right concave die assembly (10), the pipe body (1) is installed on the upper side of the left convex die assembly (15) and the right convex die assembly (7), the pipe body (1) is provided with the accessory (3) on both ends.
2. A pipe bending apparatus according to claim 1, wherein: The concave die assembly includes a left concave die assembly (13) and a right concave die assembly (10), and the left concave die assembly (13) and the right concave die assembly (10) are respectively installed on both ends of the upper side of the lower bottom plate (9), the ejection block (11) is installed between the left concave die assembly (13) and the right concave die assembly (10), and both sides of the ejection block (11) are respectively in sliding connection with the corresponding left concave die assembly (13) and right concave die assembly (10), the pipe body (1) is installed on the upper side of the left concave die assembly (13) and the right concave die assembly (10).
3. A tube bending apparatus according to claim 2, wherein: The convex die assembly includes a left convex die assembly (15) and a right convex die assembly (7), and the left convex die assembly (15) and the right convex die assembly (7) are respectively installed on both ends of the lower side of the upper bottom plate (4), the middle convex die assembly (6) is installed between the left convex die assembly (15) and the right convex die assembly (7), and both sides of the middle convex die assembly (6) are respectively in fixed connection with one side of the corresponding left convex die assembly (15) and right convex die assembly (7).
4. A pipe bending apparatus according to claim 3, wherein: The positioning pin (5) is installed between the left convex die assembly (15) and the upper bottom plate (4), and one end of the positioning pin (5) is arranged in the interior of the upper bottom plate (4), the positioning pin (5) is inserted in the interior of the left convex die assembly (15).
5. A tube bending apparatus according to claim 4, wherein: One side of the left concave die assembly (13) is fixedly installed with a sliding baffle (14), and one side of the sliding baffle (14) is in sliding connection with one side of the left convex die assembly (15), one end of the pipe body (1) is in close contact with one side of the sliding baffle (14), and both ends of the pipe body (1) are respectively installed with accessories (3).
6. A pipe bending apparatus according to claim 1, wherein: The T-shaped supporting rod (12) is installed between the ejection block (11) and the lower bottom plate (9), and one end of the T-shaped supporting rod (12) is arranged on the inner wall of the lower bottom plate (9).