Sectional type hydraulic lifting device for mounting riser tube

Abstract

The utility model discloses a sectional type hydraulic lifting device for mounting a riser tube, a fixed base structure comprises a base, a first guide frame, a second guide frame and a first fixed shaft lever, a first guide groove and a second guide groove are arranged on the first guide frame and the second guide frame, and a first floating shaft lever is connected in the second guide groove; the floating support structure comprises a third guide frame, a second fixing shaft rod and a supporting frame, the supporting frame is connected with the third fixing shaft rod, the third guide frame is provided with a third guide groove, the third guide groove is internally connected with a second floating shaft rod, and the chain is sequentially wound on the first fixing shaft rod, the third fixing shaft rod and the second fixing shaft rod; the hydraulic system is connected with and controls the first floating shaft rod and the third guide frame. According to the device, the riser tube can be safely mounted at a riser port of equipment by means of machinery in a compact space, and the ceramic riser tube can be sectionally descended at a constant speed, so that the preheating action can be completed, and the functional characteristics and the safety of the ceramic riser tube can be better ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of counter-gravity casting, in particular to a segmented hydraulic lifting device for installing a riser tube. Background Technique

[0002] Counter-gravity casting is a casting pouring and forming process developed in the 1950s of the 20th century, which is the application of Pascal's principle in casting production. It is a method that enables the metal in the crucible to overcome gravity and other resistances and fill the mold from bottom to top along the riser tube under the action of pressure, and obtain a casting under pressure. Due to its reasonable temperature field distribution, stable mold filling characteristics and good liquid feeding ability, it has been widely used in the production of high-quality aluminum-magnesium alloy castings and has become the mainstream forming technology today, especially in the production of large, complex and thin-walled high-quality components, it has almost become an irreplaceable production means. The riser tube is one of the key components of counter-gravity casting. During mold filling, under the action of air pressure, the molten metal enters the mold from the crucible through the riser tube. When the pressure is released, the unfrozen molten metal also flows back into the crucible through the riser tube. As an important component in the gating system, the riser tube has the functions of guiding and feeding, and it should have airtightness, chemical inertness and stable reliability during the mold filling process, and plays a crucial role in the counter-gravity casting process.

[0003] The ceramic riser tube not only has a relatively high melting point (1860 °C) and a relatively low thermal expansion coefficient (α≤2.0×10 -6 / K), but also has the characteristic of non-wetting with many non-ferrous metal melts such as aluminum, so it is an excellent material for manufacturing riser tubes for casting aluminum. However, as a kind of ceramic material, the main body of the riser tube made of aluminum titanate is easily decomposed into α-Al2O3 and rutile-type TiO2 at 750-1300 °C, resulting in a reduction in the mechanical properties and thermal shock resistance of the riser tube.

[0004] In the prior art, due to the compact space of the casting equipment, the ceramic riser tube can only be installed manually. During the installation process of the riser tube, due to the poor mechanical properties of its ceramic material, the ceramic riser tube is extremely prone to scratching and bumping, resulting in damage to the surface coating of the riser tube or even cracking of the body, which greatly affects its functional characteristics. Moreover, due to manual installation, it can only be put into the equipment insulation furnace at one time by the installer. The temperature in the insulation furnace is high (700 °C for molten aluminum), and when the ceramic riser tube at room temperature suddenly contacts the high-temperature aluminum liquid, it will also cause cracking or peeling of its surface coating, easily resulting in damage to the insulation function and affecting the service life of the riser tube. Content of the Utility Model

[0005] The purpose of the utility model is to provide a segmented hydraulic lifting device for installing a riser tube aiming at the defects of the prior art.

[0006] To solve the above technical problems, the present utility model provides the following technical solutions:

[0007] A segmented hydraulic lifting device for the installation of a lifting pipe, characterized in that it comprises a fixed base structure, a floating bracket structure and a hydraulic system. The fixed base structure includes a base, a first guide frame vertically and fixedly connected to the front of the base and a second guide frame at the rear, and a first fixed shaft rod horizontally and fixedly connected beside the second guide frame. First guide grooves and second guide grooves are respectively arranged on the sides of the first guide frame and the second guide frame, and a first floating shaft rod is slidably connected in the second guide groove; the floating bracket structure includes a third guide frame vertically slidably connected in the first guide frame, a second fixed shaft rod and a support frame horizontally and fixedly connected to the side of the third guide frame in sequence from top to bottom. A third fixed shaft rod is horizontally and fixedly connected to the support frame. A third guide groove communicating with the first guide groove is arranged on the side of the third guide frame, and a second floating shaft rod is slidably connected in the third guide groove. A hook is connected to the second floating shaft rod. A chain is connected between the first floating shaft rod and the second floating shaft rod, and the chain is sequentially wound around the first fixed shaft rod, the third fixed shaft rod and the second fixed shaft rod; the hydraulic system is connected to and controls the lifting of the first floating shaft rod and the third guide frame.

[0008] Further, first sprockets, second sprockets and third sprockets are respectively arranged on the first fixed shaft rod, the second fixed shaft rod and the third fixed shaft rod, and the chain is wound around the first sprocket, the second sprocket and the third sprocket.

[0009] Further, two chains are arranged in parallel, and two first sprockets, two second sprockets and two third sprockets are arranged and have equal spacing.

[0010] Further, the hydraulic system includes a first hydraulic cylinder and a second hydraulic cylinder fixedly connected to the base. The hydraulic rod at the upper end of the first hydraulic cylinder is connected to the first floating shaft rod, and the hydraulic rod at the upper end of the second hydraulic cylinder is connected to the support frame.

[0011] Further, the first hydraulic cylinder controls the lifting of the hydraulic rod through a first treadle rod and a first switch connected thereto, and the second hydraulic cylinder controls the lifting of the hydraulic rod through a second treadle rod and a second switch connected thereto.

[0012] Further, a first handle and a second handle are respectively connected to the sides of the second guide frame and the third guide frame.

[0013] Further, universal rollers are connected under the base.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] 1. Mechanically, the riser pipe can be safely installed at the liquid-risen opening of the equipment in a relatively compact space, and the ceramic riser pipe can be made to descend segmentally and uniformly, enabling it to complete the preheating action, avoiding cracking of the riser pipe caused by large temperature differences, and better ensuring its functional characteristics and safety.

[0016] 2. By utilizing the characteristic that the hydraulic cylinder can move uniformly, the entire device can be transported and lifted, and the movement process is safe and controllable.

[0017] 3. Through the floating bracket and the base divided into two parts, the segmented movement of the overall device is completed and the height of the device is greatly reduced, making it more suitable for use in narrow equipment.

[0018] 4. By the combined use of two hydraulic cylinders, the accidental drop caused by cylinder damage is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the overall structure of the embodiment of the present utility model;

[0020] Figure 2 Schematic diagram of the fixed base structure of the embodiment;

[0021] Figure 3 Schematic diagram of the floating bracket structure of the embodiment;

[0022] Figure 4 Schematic diagram of the state of the first-stage descent when installing the riser pipe in the embodiment;

[0023] Figure 5 Schematic diagram of the fully descended state when installing the riser pipe in the embodiment;

[0024] Figure 6 Schematic diagram of the state of cooperation with the casting equipment in the embodiment;

[0025] Wherein: 1 - base, 2 - first guide frame, 3 - second guide frame, 4 - first fixed shaft rod, 5 - first guide groove, 6 - second guide groove, 7 - first floating shaft rod, 8 - third guide frame, 9 - second fixed shaft rod, 10 - support frame, 11 - third fixed shaft rod, 12 - third guide groove, 13 - second floating shaft rod, 14 - hook, 15 - chain, 16 - first sprocket, 17 - second sprocket, 18 - third sprocket, 19 - first hydraulic cylinder, 20 - second hydraulic cylinder, 21 - first treadle rod, 22 - first switch, 23 - second treadle rod, 24 - second switch, 25 - first handle, 26 - second handle, 27 - universal roller, 28 - riser pipe, 29 - holding furnace. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings. This embodiment is only used to explain the present invention and does not constitute a limitation on the protection scope of the present invention.

[0027] like Figure 1-3 As shown, a specific embodiment of a segmented hydraulic lifting device for installing a liquid riser includes a fixed base structure, a floating support structure, a hydraulic system and a chain 15.

[0028] like Figure 2 As shown, the fixed base structure includes a base 1 composed of a square tube and an iron plate, a first guide frame 2 vertically fixedly connected to the front of the base 1 and a second guide frame 3 at the rear, a first fixed shaft rod 4 horizontally fixedly connected to the second guide frame 3, and first guide grooves 5 and second guide grooves 6 opposite to each other are respectively arranged on the sides of the first guide frame 2 and the second guide frame 3, and a first floating shaft rod 7 in the horizontal direction is slidably connected in the second guide groove 6. Four universal rollers 27 are connected to the four corners below the base 1. A first handle 25 is connected to the side of the second guide frame 3.

[0029] like Figure 3 As shown, the floating support structure includes a third guide frame 8 vertically slidably connected to the first guide frame 2, a second fixed shaft rod 9 and a support frame 10 horizontally fixedly connected to the side of the third guide frame 8 from top to bottom, the support frame 10 is made of a square tube in an open "曰" shape, a third fixed shaft rod 11 is horizontally fixedly connected to the open side of the support frame 10, a third guide groove 12 penetrating the first guide groove 5 is provided on the side of the third guide frame 8, a second floating shaft rod 13 is slidably connected in the third guide groove 12, and two hooks 14 are connected to the middle of the second floating shaft rod 13. A second handle 26 is connected to the side of the third guide frame 8.

[0030] like Figure 1-3 As shown, two chains 15 are connected in parallel between the first floating shaft 7 and the second floating shaft 13, and the first fixed shaft 4, the second fixed shaft 9, and the third fixed shaft 11 are respectively provided with a first sprocket 16, a second sprocket 17, and a third sprocket 18, and two first sprockets 16, second sprockets 17, and third sprockets 18 are provided and the spacing is equal. The chain 15 starts from the fixed end of the first floating shaft 7 and passes through the first sprocket 16 from the bottom, passes through the third sprocket 18 and the second sprocket 17 from the top, and ends at the fixed end of the second floating shaft 13.

[0031] The hydraulic system includes a first hydraulic cylinder 19 and a second hydraulic cylinder 20 fixedly connected to the base 1. The hydraulic rod at the upper end of the first hydraulic cylinder 19 is connected to the first floating shaft rod 7, and the hydraulic rod at the upper end of the second hydraulic cylinder 20 is connected to the support frame 10. The first hydraulic cylinder 19 controls the lifting and lowering of the hydraulic rod through the first treadle rod 21 and the first switch 22 connected thereto, and the second hydraulic cylinder 20 controls the lifting and lowering of the hydraulic rod through the second treadle rod 23 and the second switch 24 connected thereto, so as to control the lifting and lowering of the first floating shaft rod 7 and the third guide frame 8 respectively.

[0032] When the above-mentioned embodiment is in use, first step on the first treadle rod 21 and the second treadle rod 23 to jack up the first hydraulic cylinder 19 and the second hydraulic cylinder 20, and then hang the liquid-rising pipe 28 on the two hooks 14. The operator holds the first handle 25 and the second handle 26, and drives the whole device to move above the holding furnace 29 of the counter-gravity casting equipment under the drive of the universal rollers 27. As Figure 4 shown, first perform a first-stage descending operation: press the first switch 22, the first hydraulic cylinder 19 removes the jacking force. Under the gravity of the liquid-rising pipe 28, the second floating shaft rod 13 descends along the third guide groove 12 and the first guide groove 5, and at the same time drives the chain 15 to move. The other end of the chain 15 pulls the first floating shaft rod 7 to move downward along the second guide groove 6 until the ejector rod of the first hydraulic cylinder 19 is completely retracted. At this time, the first-stage descending operation of the liquid-rising pipe 28 is completed, and the liquid-rising pipe 28 enters the furnace mouth at the upper end of the holding furnace 19, so that the liquid-rising pipe 28 is preheated to avoid cracking of the liquid-rising pipe 28 due to excessive temperature difference. After baking for a period of time, as Figure 5 、 6 shown, perform a second-stage descending operation: press the second switch 24, the second hydraulic cylinder 20 removes the jacking force. Under the gravity of the liquid-rising pipe 28, the third guide frame 8 moves downward along the first guide frame 2, and the second floating shaft rod 13 continues to descend along the third guide groove 12 and the first guide groove 5 until the ejector rod of the second hydraulic cylinder 20 is completely retracted. At this time, the second-stage descending operation of the liquid-rising pipe 28 is completed, and the liquid-rising pipe 28 completely enters the holding furnace 29. Finally, remove the hooks 14 on the liquid-rising pipe 28 and move away the whole lifting device.

[0033] The above specific implementation manners are only used to illustrate the technical concept and structural features of the present invention, and are intended to enable those skilled in the art to implement it accordingly. However, the above content does not limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A sectional hydraulic lifting device for installing a liquid riser, characterized in that: The invention comprises a fixed base structure, a floating support structure and a hydraulic system, wherein the fixed base structure comprises a base (1), a first guide frame (2) vertically fixedly connected to the front of the base (1) and a second guide frame (3) at the rear, and a first fixed shaft rod (4) horizontally fixedly connected to the side of the second guide frame (3); the first guide frame (2) and the second guide frame (3) are respectively provided with a first guide groove (5) and a second guide groove (6); a first floating shaft rod (7) is slidably connected in the second guide groove (6); the floating support structure comprises a third guide frame (8) vertically slidably connected to the first guide frame (2), and second fixed shaft rods (9) horizontally fixedly connected to the side of the third guide frame (8) from top to bottom. and a support frame (10), wherein a third fixed shaft (11) is horizontally fixedly connected to the support frame (10), a third guide groove (12) which is connected to the first guide groove (5) is arranged on the side of the third guide frame (8), a second floating shaft (13) is slidably connected in the third guide groove (12), a hook (14) is connected to the second floating shaft (13), a chain (15) is connected between the first floating shaft (7) and the second floating shaft (13), and the chain (15) is sequentially wound around the first fixed shaft (4), the third fixed shaft (11) and the second fixed shaft (9); the hydraulic system connects and controls the lifting and lowering of the first floating shaft (7) and the third guide frame (8).

2. A sectional hydraulic lifting device for installing a liquid riser according to claim 1, characterized in that: The first fixed shaft (4), the second fixed shaft (9) and the third fixed shaft (11) are respectively provided with a first sprocket (16), a second sprocket (17) and a third sprocket (18); the chain (15) is wound around the first sprocket (16), the second sprocket (17) and the third sprocket (18).

3. A sectional hydraulic lifting device for installing a liquid riser according to claim 2, characterized in that: Two chains (15) are arranged in parallel, and two first sprockets (16), two second sprockets (17) and two third sprockets (18) are arranged with equal spacing.

4. The sectional hydraulic lifting device for installing a liquid riser according to claim 1, characterized in that: The hydraulic system comprises a first hydraulic cylinder (19) and a second hydraulic cylinder (20) fixedly connected to the base (1), wherein the hydraulic rod at the upper end of the first hydraulic cylinder (19) is connected to the first floating shaft (7), and the hydraulic rod at the upper end of the second hydraulic cylinder (20) is connected to the support frame (10).

5. A sectional hydraulic lifting device for installing a liquid riser according to claim 4, characterized in that: The first hydraulic cylinder (19) controls the lifting and lowering of the hydraulic rod via a first pedal (21) and a first switch (22) connected thereto, and the second hydraulic cylinder (20) controls the lifting and lowering of the hydraulic rod via a second pedal (23) and a second switch (24) connected thereto.

6. The sectional hydraulic lifting device for installing a liquid riser according to claim 1, characterized in that: The side surfaces of the second guide frame (3) and the third guide frame (8) are respectively connected with a first handle (25) and a second handle (26).

7. The sectional hydraulic lifting device for installing a liquid riser according to claim 1, characterized in that: A universal roller (27) is connected below the base (1).

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