A hydraulic boosting device

Abstract

The present invention discloses a hydraulic boosting device, which relates to the technical field of internal high-pressure hydroforming machines. The present invention is applied to the hydroforming process and solves the problem that a large amount of common air accumulates at the high position of the injection device due to the action of gravity and cannot flow out of the injection device normally, thereby affecting the quality of the hydroformed parts. The key points of its technical solution are as follows: it includes an injection cylinder and a boosting cylinder. A piston rod is arranged in the boosting cylinder, and an injection rod is arranged in the injection cylinder. The injection rod is connected to the piston rod; the injection cylinder and the boosting cylinder are arranged vertically; a main pipeline is provided on the injection cylinder; a circulation channel is opened in the injection rod. One end of the circulation channel is communicated with the main pipeline, and the other end extends outside the cylinder body of the injection cylinder and penetrates the circumference of the injection rod to form a medium outlet, so as to achieve the purpose that the air mixed in the medium can be smoothly discharged along the circulation channel through the medium outlet, and the problem that it is difficult to exhaust the air mixed in the medium of the common injection cylinder can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of internal high-pressure bulging machines, and particularly relates to a hydraulic boosting device. Background Art

[0002] Internal high-pressure forming, also known as hydroforming or hydrodynamic forming, is a material forming process that uses liquid as the forming medium and controls the internal pressure and material flow to form hollow parts. It is widely used in the fields of automotive, aviation, and aerospace manufacturing. Especially in automotive production, the internal high-pressure hydrodynamic forming process has gradually replaced the traditional processing process in the processing of parts such as car subframes, instrument panel brackets, rear subframe reinforcement pipes, SUV longitudinal and transverse arms, subframe longitudinal and transverse arms, and hot-end exhaust manifolds.

[0003] Most of the existing hydroforming equipment for internal high-pressure forming is horizontally arranged. However, after long-term use, due to the certain weight of each component device itself, wear caused by offset is likely to occur after long-term use. Moreover, when the water tank replenishes the bulging medium into the injection cylinder, air is often mixed in the medium. The inner cavity of the injection cylinder and the outer wall of the injection rod are sealed by a high-pressure seal. When the high-pressure seal fails due to wear, air will also enter the inner cavity of the injection cylinder from the gap between the injection cylinder and the injection rod. However, at this time, since the injection device is horizontally arranged, a large amount of air will be distributed at the high position of the injection device due to the action of gravity, and thus cannot flow out of the injection device normally, which will affect the bulging processing quality and the service life of the bulging die, and is likely to cause machine failures. Summary of the Invention

[0004] The purpose of the present invention is to provide a hydraulic boosting device applied to the hydroforming process to solve the common problem that it is difficult to exhaust air mixed in the medium of the injection cylinder.

[0005] The above technical purpose of the present invention is achieved through the following technical solutions: A hydraulic boosting device includes an injection cylinder and a boosting cylinder arranged opposite to each other. A piston rod capable of reciprocating along its own axis is provided in the boosting cylinder, and an injection rod capable of reciprocating along its own axis is provided in the injection cylinder. The injection rod is connected to the piston rod. The injection cylinder and the boosting cylinder are vertically arranged, and the boosting cylinder is located above the injection cylinder. A main pipeline communicating with the inside of the injection cylinder is provided on the injection cylinder. A flow passage is opened in the injection rod. One end of the flow passage is communicated with the main pipeline, and the other end extends to the outside of the cylinder body of the injection cylinder and penetrates the circumference of the injection rod to form a medium outlet.

[0006] By adopting the above technical solution, the circulation channel provided in the injection rod can make the medium outlet at a high position of the injection cylinder, so that the air mixed in the medium can be smoothly discharged along the circulation channel through the medium outlet. Secondly, the overall structure of the whole device is simple and it is also convenient for production.

[0007] In a further arrangement of the present invention, a first pipe for the input of the bulging medium is provided on the circumferential side of the injection cylinder, and the first pipe is communicated with the main pipe.

[0008] In a further arrangement of the present invention, a third pipe for the discharge of the bulging medium is provided on the side wall of the injection rod close to the boosting cylinder. One end of the third pipe is communicated with the circulation channel, and the other end is open.

[0009] In a further arrangement of the present invention, it includes a first mounting plate. The injection cylinder is arranged on the first mounting plate. There are a plurality of tie rods arranged circumferentially around the central axis of the injection cylinder on the first mounting plate. A second mounting plate is fixedly arranged at the end of the tie rod away from the first mounting plate, and the boosting cylinder is arranged on the second mounting plate.

[0010] By adopting the above technical solution, the injection cylinder is installed on the second mounting plate, and the internal space surrounded by the four tie rods is larger than the outer diameter of the injection cylinder. During maintenance, only need to pull out the injection cylinder from the injection cylinder positioning step on the second mounting plate, and the injection cylinder can be removed from the inner space of the tie rod, which can greatly reduce the maintenance difficulty and greatly reduce the maintenance cost, avoiding the problem that when the existing injection cylinder is installed through the second mounting plate, when replacing the injection cylinder, it is necessary to pull out the injection cylinder from the injection cylinder mounting plate, and the injection cylinder itself has a large weight, so it will greatly increase the maintenance difficulty.

[0011] In a further arrangement of the present invention, a connecting portion is provided at the end of the piston rod, and the injection rod is connected to the piston rod after passing through the connecting portion.

[0012] In a further arrangement of the present invention, a gap is left between the boosting cylinder and the injection cylinder.

[0013] By adopting the above technical solution, due to the self-weight of the device components in the conventional horizontal arrangement, after long-term use, problems such as eccentricity and non-coaxiality are likely to occur during the reciprocating movement of the injection cylinder and the injection rod, as well as the boosting cylinder and the piston rod, which will lead to serious wear of the machine and reduce the service life of the machine after long-term use. By adopting the above technical solution, the design of the vertical arrangement of the injection device (injection cylinder and injection rod) and the boosting device (boosting cylinder and piston rod) can effectively overcome the above problems.

[0014] Conventional pressure intensifying cylinders and injection cylinders are integrally arranged, and they are generally separated by seals. Therefore, when the media in the pressure intensifying cylinder and the injection cylinder are different, the media in the two cylinders are prone to mutual contamination, which will significantly reduce the service life of the machine after long-term use. In this solution, the open end of the third pipeline is arranged within the distance between the pressure intensifying cylinder and the injection cylinder. Therefore, the third pipeline can also be used to shunt the air in the flow pipeline. Secondly, due to the distance left between the pressure intensifying cylinder and the injection cylinder in this solution, the media in the pressure intensifying cylinder and the injection cylinder can be isolated from each other. Therefore, the media in the injection cylinder and the pressure intensifying cylinder in this solution can be of the same type or different types, which is convenient for expanding the application scope of this solution.

[0015] In a further setting of the present invention, a travel slide plate extending to the periphery of the second mounting plate is provided on the periphery of the connecting portion. A chute through which the travel slide plate can slide is provided on the second mounting plate, and the travel slide plate is slidably connected within the chute.

[0016] In a further setting of the present invention, a pulley group arranged along the axial direction of the chute is provided in the chute, and the travel slide plate is in rolling connection with the pulley group.

[0017] By adopting the above technical solution, when the piston rod makes a reciprocating motion in the pressure intensifying cylinder, the travel slide plate also simultaneously rolls reciprocally in the vertical direction on the pulley group in the chute. By clamping the travel slide plate on the pulley group in the chute, it is convenient to reduce the situation of self-rotation during the movement of the piston rod, making the reciprocating motion of the piston rod more regular and stable, and thus facilitating the improvement of the service life of the machine. The pulley group is divided into two groups and is respectively clamped on both sides of the travel slide plate to facilitate reducing the loss during the sliding process.

[0018] In a further setting of the present invention, a plurality of card slots circumferentially and uniformly distributed around its own central axis are provided on the periphery of the injection cylinder. Pressing blocks with a quantity matching that of the card slots are provided on the first mounting plate, and the pressing blocks are inserted into and clamped tightly in the card slots.

[0019] By adopting the above technical solution, through the clamping action of the card slots and the pressing blocks, it is convenient to improve the installation and disassembly efficiency of the injection cylinder on the first mounting plate.

[0020] In a further setting of the present invention, the piston rod includes a rod body and a cushion block coaxially arranged. The cushion block is detachably installed at the end of the rod body. The cushion block is slidably connected along the axial direction of the pressure intensifying cylinder within the pressure intensifying cylinder, and the cushion block is connected to the injection rod.

[0021] By adopting the above technical solution, when replacing the seal of the injection cylinder, the spacer block can be removed, and after replacing the seal of the injection cylinder, it can be reinstalled, eliminating the previous process of lifting the booster cylinder to a certain height when replacing the seal of the injection cylinder. During the replacement process, the maintenance time can be greatly saved, and the maintenance cost can be reduced.

[0022] In summary, the present invention has the following beneficial effects:

[0023] 1. The medium outlet is at the high position of the injection cylinder, and the air mixed in the medium can be smoothly discharged along the flow channel through the medium outlet, which can solve the common problem that it is difficult to exhaust air due to the air mixed in the medium of the injection cylinder.

[0024] 2. The injection device and the booster device are arranged vertically, which can effectively alleviate the problem of eccentricity during the reciprocating movement process, and thus facilitate improving the service life of the machine.

[0025] 3. The medium of the booster cylinder and the medium of the injection cylinder can be isolated from each other, so as to facilitate expanding the scope of application.

[0026] 4. It can facilitate reducing the situation of self-rotation of the piston rod during the movement process, making the reciprocating movement of the piston rod more regular and stable, and thus facilitating improving the service life of the machine.

[0027] Generally speaking, the present invention can solve the common problem that it is difficult to exhaust air due to the air mixed in the medium of the injection cylinder, and enable the air mixed in the medium to be smoothly discharged along the flow channel through the medium outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the structural schematic diagram of this embodiment;

[0029] Figure 2 is the structural schematic diagram of another perspective of this embodiment;

[0030] Figure 3 is the top view of this embodiment;

[0031] Figure 4 is Figure 3 the semi-sectional structural schematic diagram of the A-A plane of

[0032] Reference numerals: 1. First mounting plate; 2. Injection cylinder; 3. Injection rod; 4. Booster cylinder; 5. Piston rod; 51. Rod body; 52. Spacer block; 6. Flow channel; 7. Main pipeline; 8. First pipeline; 10. Third pipeline; 11. Pull rod; 12. Second mounting plate; 13. Connecting part; 14. Spacing; 15. Stroke slide plate; 16. Chute; 17. Pulley group; 18. Card slot; 19. Pressing block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The present invention will be further described in detail below with reference to the accompanying drawings.

[0034] Embodiment: A hydraulic boosting device, as Figures 1 to 4 shown, includes an injection cylinder 2 and a boosting cylinder 4 arranged oppositely. A piston rod 5 capable of reciprocating along its own axis is provided in the boosting cylinder 4, and an injection rod 3 capable of reciprocating along its own axis is provided in the injection cylinder 2. The injection rod 3 is connected to the piston rod 5. The injection cylinder 2 and the boosting cylinder 4 are arranged vertically, and the boosting cylinder 4 is located above the injection cylinder 2. A main pipeline 7 communicating with the inside of the injection cylinder 2 is provided on the injection cylinder 2. A flow passage 6 is formed in the injection rod 3. One end of the flow passage 6 communicates with the main pipeline 7, and the other end extends outside the cylinder body of the injection cylinder 2 and penetrates the circumference of the injection rod 3 to form a medium outlet.

[0035] The flow passage 6 provided in the injection rod 3 can make the medium outlet at a high position in the injection cylinder 2, and the air mixed in the medium can be smoothly discharged along the flow passage 6 through the medium outlet. Secondly, the overall structure of the whole device is simple, which is convenient for production.

[0036] A first pipeline 8 for inputting the bulging medium is provided on the circumferential side of the injection cylinder 2. The first pipeline 8 communicates with the main pipeline 7. A third pipeline 10 for discharging the bulging medium is provided on the side wall of the injection rod 3 close to the boosting cylinder 4. One end of the third pipeline 10 communicates with the flow passage 6, and the other end is open.

[0037] This embodiment further includes a first mounting plate 1. The injection cylinder 2 is arranged on the first mounting plate 1. A number of pull rods 11 are provided on the first mounting plate 1 and are arranged in a circumferential pattern around the central axis of the injection cylinder 2. A second mounting plate 12 is fixedly provided at the end of the pull rod 11 away from the first mounting plate 1, and the boosting cylinder 4 is arranged on the second mounting plate 12.

[0038] The injection cylinder 2 is arranged on the first mounting plate 1, and the internal space surrounded by the four pull rods 11 is larger than the outer diameter of the injection cylinder 2. During maintenance, only the injection cylinder 2 needs to be pulled out from the injection cylinder 2 positioning step on the first mounting plate 1, and the injection cylinder 2 can be removed from the inner space of the pull rods 11, which can greatly reduce the maintenance difficulty and greatly reduce the maintenance cost, avoiding the problem in the prior art that when the injection cylinder 2 is installed through the first mounting plate 1, when replacing the injection cylinder 2, the injection cylinder 2 needs to be pulled out from the injection cylinder 2 mounting plate, and the injection cylinder 2 itself has a large weight, so the maintenance difficulty will be greatly increased.

[0039] A connecting portion 13 is provided at the end of the piston rod 5. The injection rod 3 passes through the connecting portion 13 and is connected to the piston rod 5. A spacing 14 is left between the boosting cylinder 4 and the injection cylinder 2.

[0040] Due to the self-weight of the device components, the conventional horizontal layout is prone to eccentricity and misalignment problems during the reciprocating movement of the injection cylinder 2 and the injection rod 3, as well as the boosting cylinder 4 and the piston rod 5 after long-term use. As a result, the machine wears severely, and the service life of the machine will also be reduced after long-term use. By adopting the above technical solution, the injection device (injection cylinder 2 and injection rod 3) and the boosting device (boosting cylinder 4 and piston rod 5) are designed to be vertically arranged, which can effectively overcome the above problems.

[0041] Moreover, the conventional boosting cylinder 4 and injection cylinder 2 are integrally arranged and are generally separated by a seal between them. Therefore, when the media in the boosting cylinder 4 and the injection cylinder 2 are inconsistent, the media in the two cylinders are prone to mutual contamination, which will greatly reduce the service life of the machine after long-term use. In this solution, the open end of the third pipe 10 is arranged within the spacing 14 between the boosting cylinder 4 and the injection cylinder 2. Therefore, the third pipe 10 can also be used to divert the air in the flow pipe. Secondly, due to the spacing 14 left between the boosting cylinder 4 and the injection cylinder 2 in this solution, the media in the boosting cylinder 4 and the injection cylinder 2 can be isolated from each other. Therefore, the media in the injection cylinder 2 and the boosting cylinder 4 in this solution can be of the same type or different types, which is convenient for improving the application range of this solution.

[0042] A travel slide plate 15 extending to the periphery of the second mounting plate 12 is provided on the periphery of the connecting portion 13. A chute 16 through which the travel slide plate 15 can slide is provided on the second mounting plate 12. The travel slide plate 15 is slidably connected within the chute 16. A pulley group 17 arranged along the axial direction of the chute 16 is provided within the chute 16, and the travel slide plate 15 is in rolling connection with the pulley group 17.

[0043] When the piston rod 5 reciprocates within the boosting cylinder 4, the travel slide plate 15 also reciprocally rolls vertically on the pulley group 17 within the chute 16 at the same time. By clamping the travel slide plate 15 on the pulley group 17 within the chute 16, it is convenient to reduce the situation of the piston rod 5 rotating during movement, making the reciprocating movement of the piston rod 5 more regular and stable, and thus convenient for improving the service life of the machine. The pulley group 17 is divided into two groups and is respectively clamped on both sides of the travel slide plate 15 to facilitate reducing the loss during the sliding process.

[0044] A number of card slots 18 evenly distributed circumferentially around its own central axis are provided on the periphery of the injection cylinder 2. The first mounting plate 1 is provided with pressing blocks 19 with a quantity matching that of the card slots 18, and the pressing blocks 19 are inserted into and clamped tightly within the card slots 18. Through the clamping action of the card slots 18 and the pressing blocks 19, it is convenient to improve the installation and disassembly efficiency of the injection cylinder 2 on the first mounting plate 1.

[0045] The piston rod 5 includes a rod body 51 and a cushion block 52 arranged coaxially. The cushion block 52 is detachably installed at the end of the rod body 51. The cushion block 52 is slidably connected to the inside of the booster cylinder 4 along the axial direction of the booster cylinder 4, and the cushion block 52 is connected to the injection rod 3.

[0046] When replacing the seal of the injection cylinder 2, the cushion block 52 can be removed, and after replacing the seal of the injection cylinder 2, the cushion block 52 is reinstalled. This saves the process of lifting the booster cylinder 4 to a certain height when replacing the seal of the injection cylinder 2 in the past. During the replacement process, the maintenance time can be greatly saved, and the maintenance cost can be reduced.

[0047] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions according to needs, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. A hydraulic boosting device, comprising an injection cylinder (2) and a boosting cylinder (4) which are oppositely arranged. A piston rod (5) capable of reciprocating along its own axial direction is arranged in the boosting cylinder (4), and an injection rod (3) capable of reciprocating along its own axial direction is arranged in the injection cylinder (2). The injection rod (3) is connected to the piston rod (5); characterized in that, The injection cylinder (2) and the booster cylinder (4) are arranged vertically, and the booster cylinder (4) is located above the injection cylinder (2); the injection cylinder (2) is provided with a main pipeline (7) connected to the interior of the injection cylinder (2); a circulation channel (6) is provided in the injection rod (3), the lower end of the circulation channel (6) is connected to the main pipeline (7), and the upper end extends to the cylinder body of the injection cylinder (2) and penetrates the circumference of the injection rod (3) to form a medium outlet; The medium in the injection cylinder (2) is liquid; a distance (14) is left between the booster cylinder (4) and the injection cylinder (2); A first pipeline (8) for inputting a bulging medium is provided on the peripheral side of the injection cylinder (2), and the first pipeline (8) is connected to the main pipeline (7); A third pipe (10) for discharging the bulging medium is provided on the side wall of the injection rod (3) close to the booster cylinder (4); one end of the third pipe (10) is connected to the circulation channel (6) and the other end is open.

2. The hydraulic pressure boosting device according to claim 1, characterized in that, It comprises a first mounting plate (1), the injection cylinder (2) is arranged on the first mounting plate (1), the first mounting plate (1) is provided with a plurality of pull rods (11) which are arranged in a circle around the central axis of the injection cylinder (2), a second mounting plate (12) is fixedly provided on one end of the pull rod (11) which is away from the first mounting plate (1), and the boosting cylinder (4) is arranged on the second mounting plate (12).

3. A hydraulic boosting device according to claim 2, characterized in that, A connecting portion (13) is provided at the end of the piston rod (5), and the injection rod (3) is connected to the piston rod (5) after passing through the connecting portion (13).

4. A hydraulic boosting device according to claim 3, characterized in that, A travel slide plate (15) extending to the periphery of the second mounting plate (12) is provided on the peripheral side of the connecting portion (13); a slide groove (16) through which the travel slide plate (15) can slide is provided on the second mounting plate (12); and the travel slide plate (15) is slidably connected in the slide groove (16).

5. A hydraulic boosting device according to claim 4, characterized in that, A pulley block (17) is arranged in the slide groove (16) along the axial direction of the slide groove (16), and the travel slide plate (15) is rollingly connected to the pulley block (17).

6. The hydraulic pressure boosting device according to claim 2, characterized in that, The injection cylinder (2) is provided with a plurality of slots (18) uniformly distributed around its central axis on its circumference, and the first mounting plate (1) is provided with a number of pressing blocks (19) matching the number of the slots (18), and the pressing blocks (19) are inserted into and clamped in the slots (18).

7. A hydraulic boosting device according to claim 1, wherein The piston rod (5) comprises a coaxially arranged rod body (51) and a cushion block (52); the cushion block (52) is detachably mounted on the end of the rod body (51); the cushion block (52) is slidably connected to the booster cylinder (4) along the axial direction of the booster cylinder (4); and the cushion block (52) is connected to the injection rod (3).

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