Three-way pipe forming machine

Abstract

The utility model belongs to the field of three-way pipe manufacturing equipment, and particularly relates to a three-way pipe forming machine which comprises a workbench, a lifting pressing block, two horizontal side pressing cylinders, a pressure boosting and maintaining device and an automatic mechanical arm. A lower die can be fixed on the workbench, an upper die can be fixed on the lifting pressing block, and the lifting pressing block can drive the upper die to be pressed on the lower die. The two horizontal side pressure cylinders can respectively perform centering extrusion on the two ends of the pipe blank, so that the length of the pipe blank is reduced in the axial direction, the water pressure in the pipe blank is improved, and a branch pipe is expanded; the pressure boosting and maintaining device can be used for boosting and maintaining the pressure of water introduced into the inner cavity of the pipe blank, so that the forming efficiency of the branch pipe is improved; the automatic mechanical arm can complete the tasks of feeding, discharging and die changing, the three-way pipe forming machine has three functions, the size of the three-way pipe forming machine is greatly reduced, and the occupied space is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of three-way pipe manufacturing equipment, and particularly relates to a three-way pipe forming machine. Background Art

[0002] The general method for forming a three-way pipe is to first place a pipe blank into a mold, then simultaneously introduce water into both sides of the inner cavity of the pipe blank, and then use two horizontal side cylinders of a hydraulic press to synchronously move in a centering manner to extrude the pipe blank. After being extruded, the volume of the pipe blank becomes smaller, and the water in the pipe blank increases in pressure as the volume of the pipe blank decreases. When the pressure required for expanding the branch pipe of the stainless steel three-way pipe is reached, the metal material flows along the inner cavity of the mold under the dual action of the side cylinder and the liquid pressure in the pipe blank to expand the branch pipe.

[0003] However, in the existing forming method, the expansion of the branch pipe requires waiting for the volume of the pipe blank to be slowly compressed and reduced, which results in a longer forming time and lower forming efficiency. Traditionally, loading and unloading are mainly carried out by a loading and unloading robot, while the replacement of the mold requires an additional device. The loading and unloading robot and the mold replacement device increase the overall occupied space of the equipment and also result in higher maintenance costs. Summary of the Utility Model

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the disadvantages of the existing three-way pipe forming method, such as longer forming time, slower forming efficiency, larger overall volume of the forming equipment, larger space occupation, and higher maintenance costs.

[0005] To solve the above technical problem, the utility model provides a three-way pipe forming machine, which includes a workbench, a liftable pressing block, two horizontal side pressing cylinders, a pressure boosting and pressure maintaining device, and an automatic robotic arm.

[0006] The pressure boosting and pressure maintaining device is fixed at the rear side of the workbench. The pressure boosting and pressure maintaining device includes a first cylinder body, a second cylinder body, a first piston, a piston rod, and a second piston. The shell of the first cylinder body is fixedly connected in series with the shell of the second cylinder body. The diameter of the shell of the second cylinder body is smaller than that of the shell of the first cylinder body. An inlet hole is provided at the front end of the first cylinder body, and an outlet hole is provided at the rear end of the second cylinder body. A check valve is fixed at the rear end of the second cylinder body. The inlet of the check valve is communicated with the outlet hole. The check valve includes two outlets, and the two outlets are respectively connected to both ends of the pipe blank through two hoses. The diameter of the first piston is larger than that of the second piston.

[0007] The automatic robotic arm includes a support plate, an arm body, a grasping mechanism, and a slewing mechanism. The support plate is horizontally fixed on the front side wall of the workbench. The slewing mechanism is slidably connected to the support plate and can reciprocate linearly between the outer end and the inner end of the support plate. The bottom of the arm body is fixed on the actuator of the slewing mechanism. The grasping mechanism is slidably connected to the arm body and can move up and down along the height direction of the arm body.

[0008] Preferably, it further includes a displacement rod and a displacement sensor. A through hole is provided at the front end of the housing of the first cylinder. The displacement rod can pass through the through hole and be fixed to the first piston. The displacement sensor is fixed on the inner wall of the housing of the first cylinder, and the displacement rod and the displacement sensor can cooperate with each other.

[0009] Preferably, a first flange is provided at the rear end of the housing of the first cylinder, and a second flange is provided at the front end of the housing of the second cylinder. The first flange and the second flange are fixed together in an aligned manner.

[0010] Preferably, it further includes an electric push rod. The body of the electric push rod is horizontally fixed on the support plate, and the push rod of the electric push rod is fixed to the slewing mechanism.

[0011] Preferably, the grasping mechanism is slidably connected to the arm body through a connecting plate.

[0012] Preferably, the grasping mechanism includes a first finger, a second finger, four connecting rods, a main rod, and a grasping drive mechanism. The rear ends of the first finger and the second finger are both hinged to the connecting plate. The main rod and the four connecting rods are all located at the front end between the first finger and the second finger. One end of two of the connecting rods is hinged to the first finger, and the other end is hinged to the main rod. One end of the other two connecting rods is hinged to the second finger, and the other end is hinged to the main rod. The grasping drive mechanism is a hydraulic cylinder, and the telescopic rod of the hydraulic cylinder is concentrically fixed to the main rod.

[0013] Preferably, the grasping mechanism further includes two closely arranged grasping columns arranged oppositely. An inner side surface at the front end of each of the first finger and the second finger is provided with one of the closely arranged grasping columns. Each of the closely arranged grasping columns includes a fixed rod and a rubber column. One end of the fixed rod is fixed to the finger, and the other end is fixed with a rubber column.

[0014] Preferably, the slewing mechanism is a slewing support bearing.

[0015] The technical solution of the present utility model has the following beneficial effects:

[0016] The pressure boosting and maintaining device of the present utility model includes a first cylinder block and a second cylinder block. After the water originally required to be introduced into the inner cavity of the pipe blank is jointly boosted by the first cylinder block and the second cylinder block, the pressure is increased by dozens of times, and then it is introduced into the inner cavity of the pipe blank. Due to the combined action of the high-pressure water and the horizontal side pressing cylinder, the branch pipe can be quickly expanded, improving the forming efficiency of the three-way pipe; the present utility model includes an automatic robotic arm, which can perform three functions with one machine and can complete the tasks of loading, unloading, and replacing the mold, reducing the volume of the entire three-way pipe forming equipment, reducing the occupied space, and also reducing the maintenance cost. Brief Description of the Drawings

[0017] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required to be used in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Description of the reference numerals: 1, workbench; 2, liftable pressure block; 3, horizontal side pressing cylinder; 4, pressure boosting and maintaining device; 5, automatic robotic arm; 41, first cylinder block; 411, through hole; 412, water inlet hole; 413, first flange; 42, second cylinder block; 421, water outlet hole; 422, second flange; 43, displacement rod; 44, first piston; 45, piston rod; 46, second piston; 47, displacement sensor; 48, one-way valve; 410, front side rodless chamber; 420, rear side rodless chamber; 51, electric push rod; 52, arm body; 53, grasping mechanism; 531, first finger; 532, second finger; 533, connecting rod; 534, main rod; 535, grasping driving mechanism; 536, tightly grasping column; 536a, fixed rod; 536b, rubber column; 537, slewing mechanism; 538, connecting plate; 539, servo motor; 54, support plate; 6, pipe blank.

[0019] Figure 1 It is the overall schematic diagram of the first perspective of the present utility model;

[0020] Figure 2 It is the cross-sectional view of the pressure boosting and maintaining device of the present utility model;

[0021] Figure 3 It is the external schematic diagram of the pressure boosting and maintaining device of the present utility model;

[0022] Figure 4 It is the overall schematic diagram of the second perspective of the present utility model;

[0023] Figure 5 It is the overall schematic diagram of the automatic robotic arm of the present utility model. Detailed Description of the Embodiments

[0024] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work belong to the scope of protection of the present utility model.

[0025] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0026] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0027] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] The present utility model provides a three-way pipe forming machine, which includes a workbench 1, a liftable pressure block 2, two horizontal side pressure cylinders 3, a pressure boosting and pressure maintaining device 4, and an automatic robotic arm 5.

[0029] A lower die can be fixed on the workbench 1 of the present utility model, and an upper die can be fixed on the liftable pressure block 2. The liftable pressure block 2 can drive the upper die to press on the lower die, thereby limiting the pipe blank 6 inside the mold. The two horizontal side pressure cylinders 3 can respectively perform centering extrusion on both ends of the pipe blank 6, thereby reducing the length of the pipe blank 6 axially, increasing the water pressure inside the pipe blank 6, and expanding the branch pipe; while the pressure boosting and pressure maintaining device 4 can boost and maintain the pressure of the water introduced into the inner cavity of the pipe blank 6, improving the forming efficiency of the branch pipe; the automatic robotic arm 5 can complete the tasks of feeding, discharging (the pipe blank 6) (the three-way pipe), and changing the mold, serving three purposes with one machine, greatly reducing the volume of the three-way pipe forming machine and reducing the space occupation.

[0030] The pressure boosting and pressure maintaining device 4 is fixed to the rear side of the workbench 1. The pressure boosting and pressure maintaining device 4 includes a first cylinder block 41, a second cylinder block 42, a first piston 44, a piston rod 45, and a second piston 46. The housing of the first cylinder block 41 is fixedly connected in series with the housing of the second cylinder block 42. The diameter of the housing of the second cylinder block 42 is smaller than that of the housing of the first cylinder block 41. An inlet hole 412 is provided at the front end of the first cylinder block 41, and an outlet hole 421 is provided at the rear end of the second cylinder block 42. A check valve 48 is fixed to the rear end of the second cylinder block 42. The inlet of the check valve 48 is communicated with the outlet hole 421. The check valve 48 includes two outlets, and the two outlets are respectively connected to both ends of the tube blank 6 through two hoses. The diameter of the first piston 44 is larger than that of the second piston 46.

[0031] When it is necessary to pressurize and form the tube blank 6, water enters the front-side rodless chamber 410 through the inlet hole 412, pushing the first piston 44, the piston rod 45, and the second piston 46 to move backward. Since the area of the front-side rodless chamber 410 is larger, the pressure of the water in the front-side rodless chamber 410 is smaller. After the water enters the rear-side rodless chamber 420, since the area of the rear-side rodless chamber 420 becomes smaller, the pressure-receiving area of the water in the rear-side rodless chamber 420 becomes smaller, and the pressure increases. Compared with the pressure in the front-side rodless chamber 410, the pressure has increased by dozens of times. After the water with increased pressure comes out from the outlet hole 421, it flows into the chambers at both ends of the tube blank 6 through two hoses respectively, providing pressure for both ends of the chamber of the tube blank 6.

[0032] The check valve 48 provided at the rear end of the second cylinder block 42 can prevent water from flowing back from the rear end to the front end, affecting the pressure boosting effect of the water.

[0033] The utility model further includes a displacement rod 43 and a displacement sensor 47. A through hole 411 is provided at the front end of the housing of the first cylinder block 41. The displacement rod 43 can pass through the through hole 411 and be fixed to the first piston 44. The displacement sensor 47 is fixed to the inner wall of the housing of the first cylinder block 41, and the displacement rod 43 and the displacement sensor 47 can cooperate with each other. When forming the three-way pipe, it is necessary to continuously apply water pressure to both ends of the chamber of the tube blank 6 for a period of time, rather than just for an instant. Therefore, the length of the second cylinder block 42 is just enough for the piston to move a certain stroke, and this stroke meets the requirement of the time length for continuous pressurization. The displacement sensor 47 can detect the displacement distance of the displacement rod 43 in real time, that is, the moving distance of the piston rod 45. This structural design enables the displacement sensor 47 to prevent the inlet hole 412 from continuing to admit water after detecting that the second piston 46 reaches the maximum backward moving stroke, and the water returns through the water return hole on the first cylinder block 41, so that the second piston 46 returns to the front end of the first cylinder block 41 for the next pressure boosting.

[0034] The specific way of connecting the housing of the first cylinder block 41 and the housing of the second cylinder block 42 in series: A first flange 413 is provided at the rear end of the housing of the first cylinder block 41, and a second flange 422 is provided at the front end of the housing of the second cylinder block 42. The first flange 413 and the second flange 422 are fixed together in alignment.

[0035] The automatic robotic arm 5 includes a support plate 54, an arm body 52, a grasping mechanism 53, and a slewing mechanism 537. The support plate 54 is horizontally fixed on the front side wall of the workbench 1. The slewing mechanism 537 is slidably connected to the support plate 54 and can reciprocate linearly between the outer end and the inner end of the support plate 54. The bottom of the arm body 52 is fixed on the actuator of the slewing mechanism 537. The grasping mechanism 53 is slidably connected to the arm body 52 and can move up and down along the height direction of the arm body 52.

[0036] In the initial state, the arm body 52 is located at the outer end of the support plate 54, that is, at a certain distance from the workbench 1.

[0037] Specific introduction to the three functions of the automatic robotic arm:

[0038] First, the mold can be replaced: If you want to replace the three-way pipe mold, the arm body 523 can be pushed to one end close to the workbench 1 by using a linear reciprocating movement mechanism. Then, the grasping mechanism 53 can grasp the old mold tightly. Then, the arm body 52 is retracted to its original position. Then, the arm body 523 is rotated 180° by using the slewing mechanism 537, with the grasping mechanism facing away from the workbench 1. The grasping mechanism 53 puts down the old mold. Then, after grasping a new mold, the arm body 52 is rotated 180° again, and the grasping mechanism 53 faces the workbench 1 again. Then, the arm body 52 is pushed to one end close to the molding machine, and the grasping mechanism 53 releases the mold, so that the lower mold is installed on the workbench 1 and the upper mold is installed on the liftable pressure block 2.

[0039] Second, feeding can be performed: After the mold is replaced, the arm body 52 retracts to its original position. The slewing mechanism 537 drives the arm body 52 to rotate 90 degrees clockwise, so that the grasping mechanism 53 faces the left side. The grasping mechanism 53 grasps the pipe blank 6 placed on the left side. The arm body 52 rotates 90° counterclockwise and faces the workbench 1 again. The arm body 52 advances to the workbench 1, and the grasping mechanism 53 releases the pipe blank 6 and places it into the lower mold.

[0040] Third, discharging can be performed: After the three-way pipe is formed, the grasping mechanism 53 grasps the three-way pipe. Then, the arm body 52 retracts to its original position. The arm body 52 rotates 90° counterclockwise, and the grasping mechanism 53 faces the right side. The grasping mechanism 53 releases the three-way pipe and places it into the product collection box on the right side.

[0041] The purpose of the grasping mechanism 53 being able to move up and down on the arm body 52 is to make the height position of the grasping mechanism 53 match the height position of the object to be grasped or the height position to be placed.

[0042] The utility model further includes an electric push rod 51. The body of the electric push rod 51 is horizontally fixed on the support plate 54, and the push rod of the electric push rod 51 is fixed to the slewing mechanism 537. When the push rod of the electric push rod 51 expands and contracts, the slewing mechanism 537 can be pushed back and forth, so that the arm body 52 realizes a reciprocating movement working state.

[0043] The grasping mechanism 53 is slidably connected to the arm body 52 through a connecting plate 538, and the connecting plate 538 is slidably connected to the arm body 52.

[0044] The grasping mechanism 53 includes a first finger 531, a second finger 532, four connecting rods 533, a main rod 534 and a grasping driving mechanism 535. The rear ends of the first finger 531 and the second finger 532 are both hinged to the connecting plate 538. The main rod 534 and the four connecting rods 533 are both located at the front ends between the first finger 531 and the second finger 532. One end of two of the connecting rods 533 is hinged to the first finger 531, and the other end is hinged to the main rod 534. One end of the other two connecting rods 533 is hinged to the second finger 532, and the other end is hinged to the main rod 534. The grasping driving mechanism 535 is a hydraulic cylinder, and the telescopic rod of the hydraulic cylinder is concentrically fixed to the main rod 534. When the telescopic rod of the hydraulic cylinder is pushed forward, the main rod 534 also moves forward, the angle of the connecting rod 533 increases, the first finger 531 and the second finger 532 rotate outwards and open, and the distance between the front ends of the first finger 531 and the second finger 532 increases. At this time, an object can be released. When the telescopic rod of the hydraulic cylinder retracts, the main rod 534 also moves backward, the angle of the connecting rod 533 decreases, the first finger 531 and the second finger 532 rotate inwards, and the distance between the front ends of the first finger 531 and the second finger 532 decreases. At this time, an object can be clamped.

[0045] The grasping mechanism 53 further includes two closely arranged grasping columns 536 arranged oppositely. A closely arranged grasping column 536 is provided on the inner side surface of the front end of each of the first finger 531 and the second finger 532. The closely arranged grasping column 536 includes a fixed rod 536a and a rubber column 536b. One end of the fixed rod 536a is fixed to the finger, and the other end fixes a rubber column 536b. On the one hand, the fixed rod 536a serves to carry the rubber column 536b. The rubber column 536b is sleeved on the front half of the fixed rod 536a and is adhesively bonded above. On the other hand, it serves to fix it to the finger. Since the rubber column 536b has elasticity, it can adapt to objects of different shapes being clamped, improving the firmness of clamping; and it can reduce the wear of the fingers and the object.

[0046] The slewing mechanism 537 is a slewing bearing. The slewing bearing is a prior art product, including an inner ring, an outer ring, a driving gear, and a protective housing. The inner ring is fixed within the protective housing, the outer ring is sleeved outside the inner ring, the inner wall of the outer ring is slidably connected to the outer wall of the inner ring, the outer ring can rotate about its own center of rotation, a circle of teeth is provided on the circumferential surface of the outer ring, the driving gear is located within the protective housing, the body of the servo motor 539 is fixed on the protective housing, its rotating rod penetrates into the protective housing, and the free end of the rotating rod is concentrically fixed with the driving gear, and the driving gear meshes with the teeth of the outer ring. When the rotating rod of the servo motor 539 rotates, the driving gear rotates, driving the outer ring to rotate. The boom body 52 is fixed to the outer ring.

[0047] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. The obvious changes or variations derived therefrom still fall within the protection scope of the creation of the present utility model.

Claims

1. A three-way pipe forming machine, comprising a workbench (1), a lifting and lowering pressure block (2) and two horizontal side pressure cylinders (3), characterized in that: It also includes a pressure boosting and pressure maintaining device (4) and an automatic mechanical arm (5). The pressure-increasing and pressure-maintaining device (4) is fixed on the rear side of the workbench (1), and comprises a first cylinder body (41), a second cylinder body (42), a first piston (44), a piston rod (45), and a second piston (46). The shell of the first cylinder body (41) and the shell of the second cylinder body (42) are fixed in series, and the shell diameter of the second cylinder body (42) is smaller than the shell diameter of the first cylinder body (41). The front end of the first cylinder body (41) is provided with a water inlet hole (412), and the rear end of the second cylinder body (42) is provided with a water outlet hole (421). A one-way valve (48) is fixed to the rear end of the second cylinder body (42), and the inlet of the one-way valve (48) is connected to the water outlet hole (421). The one-way valve (48) comprises two outlets, and the two outlets are respectively connected to two ends of the tube blank (6) by two hoses. The diameter of the first piston (44) is larger than the diameter of the second piston (46). The automatic mechanical arm (5) comprises a support plate (54), an arm body (52), a grasping mechanism (53) and a rotating mechanism (537); the support plate (54) is horizontally fixed on the front side wall of the workbench (1); the rotating mechanism (537) is slidably connected to the support plate (54); the rotating mechanism (537) can reciprocate linearly between the outer end and the inner end of the support plate (54); the bottom of the arm body (52) is fixed on the actuator of the rotating mechanism (537); the grasping mechanism (53) is slidably connected to the arm body (52) and can be raised and lowered along the height direction of the arm body (52).

2. The three-way pipe forming machine according to claim 1, characterized in that: It also includes a displacement rod (43) and a displacement sensor (47); a through hole (411) is provided at the front end of the shell of the first cylinder body (41); the displacement rod (43) can pass through the through hole (411) and be fixed to the first piston (44); the displacement sensor (47) is fixed to the inner wall of the shell of the first cylinder body (41); and the displacement rod (43) and the displacement sensor (47) can cooperate with each other.

3. The three-way pipe forming machine according to claim 1, characterized in that: A first flange (413) is provided at the rear end of the shell of the first cylinder body (41), and a second flange (422) is provided at the front end of the shell of the second cylinder body (42); the first flange (413) and the second flange (422) are matched and fixed together.

4. The three-way pipe forming machine according to claim 1, characterized in that: It also comprises an electric push rod (51), the body of the electric push rod (51) being fixed horizontally on the support plate (54), and the push rod of the electric push rod (51) being fixed to the rotary mechanism (537).

5. The three-way pipe forming machine according to claim 1, characterized in that: The grabbing mechanism (53) is slidably connected to the arm body (52) via a connecting plate (538).

6. The three-way pipe forming machine according to claim 5, characterized in that: The gripping mechanism (53) comprises a first gripping finger (531), a second gripping finger (532), four connecting rods (533), a main rod (534) and a gripping drive mechanism (535); the rear ends of the first gripping finger (531) and the second gripping finger (532) are hinged to the connecting plate (538); the main rod (534) and the four connecting rods (533) are located at the front end between the first gripping finger (531) and the second gripping finger (532); one end of two connecting rods (533) is hinged to the first gripping finger (531) and the other end is hinged to the main rod (534); one end of the other two connecting rods (533) is hinged to the second gripping finger (532) and the other end is hinged to the main rod (534); the gripping drive mechanism (535) is a hydraulic cylinder; the telescopic rod of the hydraulic cylinder is fixed concentrically with the main rod (534).

7. The three-way pipe forming machine according to claim 6, characterized in that: The gripping mechanism (53) further comprises two tight gripping columns (536) arranged opposite to each other, wherein the first gripping finger (531) and the second gripping finger (532) are each provided with a tight gripping column (536) on the inner side surface of the front end, and the tight gripping column (536) comprises a fixing rod (536a) and a rubber column (536b), wherein one end of the fixing rod (536a) is fixed to the gripping finger, and the other end is fixed to a rubber column (536b).

8. The three-way pipe forming machine according to claim 1, characterized in that: The slewing mechanism (537) is a slewing support bearing.

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