Annular output hydraulic device and process

Abstract

The invention relates to the technical field of hydraulic cylinders, in particular to an annular output hydraulic device and process, which comprises a cylinder body and a cylinder cover which are fixedly connected with each other and internally form a cavity, and further comprises a first piston and a piston rod, the first piston is slidably connected to the inside of the cavity, one end of the piston rod is fixedly connected to the first piston, and the other end of the piston rod is fixedly connected to the cylinder body. The other end extends out of the cylinder cover for a certain length to form a free end; the multiple piston rods are distributed on the first piston at certain intervals, and therefore a multi-rod synchronous output transmission structure is formed. Finally, the outer ring of the upper die is directly driven by the hydraulic device with annular output, so that the outer ring of the upper die can be automatically subjected to secondary pressing, the overall density of the upper die is improved, and the product quality of the upper die is enhanced. And the automation degree is high, the technological process is convenient, operation is easy, and production efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, and in particular to a hydraulic device and process with an annular output. Background Art

[0002] Usually, in order to press barrel-shaped plastic products on ordinary hydraulic presses, in order to achieve a higher density of the product, the pressing process is generally divided into two steps. The first step is to press the semi-finished product into a barrel shape, and a certain amount of pre-compression margin is reserved on the surrounding side walls.

[0003] In the second step, when the plastic product is still in a molten state and has not been completely cooled and shaped, the excess of the side wall is pressed again, and finally a barrel-shaped plastic product that meets the production density is obtained.

[0004] In order to ensure that the outer ring of the upper die can continue to be pressed downward, a secondary pressing is required in actual production. After the first pressing is completed, the upper plate of the hydraulic press moves upward, and an additional ring is added above the outer ring of the upper die pressed for the first time. Then the upper plate of the hydraulic press is pressed downward to apply pressure to the additional ring, thereby pressurizing the remaining amount of the side wall again.

[0005] This secondary pressing process increases the difficulty and cost of production. Especially for large molds, it is a very difficult task to place the additional ring above the outer ring of the upper mold pressed for the first time, and it causes trouble for the automation of production.

[0006] For example, the Chinese patent document with publication number CN116020894A discloses a double-angle variable-diameter extrusion forming die and process for annular cylindrical parts and other channels, which specifically discloses: placing an annular or cylindrical hollow blank to be formed into a straight-wall extrusion channel I, and placing an extrusion gasket ring on top of the hollow blank; then placing an extrusion punch on top of the extrusion gasket ring, using a pressure device to apply force to the extrusion punch through a punch pressure plate, and the extrusion punch hot-extrudes the hollow blank through the extrusion gasket ring.

[0007] It needs to remove the extrusion punch, place the extrusion pad ring, and use the extrusion pad ring to extrude the blank. The process flow is complicated and the operation is troublesome, which is not conducive to improving production efficiency. Summary of the invention

[0008] In order to overcome the above-mentioned shortcomings, the present invention aims to provide a technical solution that can solve the above-mentioned problems.

[0009] The present invention provides a hydraulic device with an annular output, comprising a cylinder body and a cylinder head which are fixedly connected to each other and have a cavity formed inside, and also comprising a first piston and a piston rod. The first piston is slidably connected to the inside of the cavity, one end of the piston rod is fixedly connected to the first piston, and the other end thereof extends out of the cylinder head by a certain length to form a free end; a plurality of piston rods are distributed on the first piston at a certain distance, thereby forming a transmission structure with multi-rod synchronous output.

[0010] As a further solution of the present invention: a plurality of piston rods are arranged at even intervals from each other, and are installed on the first piston in an annular structure as a whole, thereby forming a transmission structure with a multi-rod annular output.

[0011] As a further solution of the present invention: a support column is provided in the cylinder body, and the support column is fixedly connected to the inside of the cylinder body, one end of which abuts against the top of the cylinder body, and the other end abuts against the cylinder cover, and the space between the outer wall of the support column and the inner wall of the cylinder body forms a chamber for the reciprocating movement of the first piston.

[0012] As a further solution of the present invention: the first piston is set as an annular structure and is sleeved on the support column, so that the inner wall of the first piston abuts against the outer wall of the support column, and the outer wall of the first piston abuts against the inner wall of the cylinder body.

[0013] As a further solution of the present invention: a first sealing ring is provided between the inner wall of the first piston and the outer wall of the support column, so that the contact part between the two forms a sealed sliding connection; a second sealing ring is provided between the outer wall of the first piston and the inner wall of the cylinder body, so that the contact part between the two forms a sealed sliding connection.

[0014] As a further solution of the present invention: a first groove is provided at the position where the cylinder head abuts against the support column, and one end of the support column is inserted into the first groove, thereby forming a limit in the radial direction of the support column.

[0015] As a further solution of the present invention: a second groove is provided at the position where the cylinder cover abuts against the cylinder side wall, and one end of the cylinder side wall is penetrated into the second groove, thereby limiting the cylinder side wall.

[0016] As a further solution of the present invention: a third sealing ring is further provided at the position where the cylinder cover abuts against the cylinder body, so that a sealing connection is formed at the connection between the cylinder cover and the cylinder body.

[0017] As a further solution of the present invention: the cylinder cover is provided with a first through hole at the position corresponding to the piston rod, one end of the piston rod is passed through the first through hole and extends out of the cylinder cover for a certain distance; a fourth sealing ring is provided between the side wall of the first through hole and the piston rod, so as to form a sealed sliding connection between the piston rod and the cylinder cover.

[0018] The present invention also provides a production process, which uses the above-mentioned annular output hydraulic device for production. First, the cylindrical lower mold is installed on the lower plate of the hydraulic press, the top of the cylinder body of the hydraulic device is installed on the upper plate of the hydraulic press, the inner core of the upper mold is installed on the lower end of the cylinder cover of the hydraulic device, and the outer ring of the upper mold is installed on the piston rod of the hydraulic device; then the hydraulic press is operated to drive the upper plate to move downward, so that the hydraulic device, the inner core of the upper mold and the outer ring of the upper mold move downward synchronously and are pressed into the preset cavity of the cylindrical lower mold, so that it performs compression molding on the molten plastic in the preset cavity; then the position and pressure between the upper plate and the lower plate of the hydraulic press are maintained unchanged, and the hydraulic device is operated to drive the outer ring of the upper mold to press downward, thereby performing secondary compression on the side wall of the product.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a hydraulic device with an annular output, it can be directly installed between the upper plate of the hydraulic press and the inner core of the upper mold, so that the strong pressure of the hydraulic press can be directly transmitted to the inner core of the upper mold and pressed into the cylindrical lower mold, thereby pressing and forming a barrel-shaped plastic product. Then, without removing the upper plate of the hydraulic press, the position and pressure between the upper plate and the lower plate of the hydraulic press remain unchanged, and the outer ring of the upper mold is pressed down by directly operating the hydraulic device, thereby performing a secondary compression on the side wall of the barrel-shaped plastic product, improving its overall density and enhancing its product quality. In addition, it has a high degree of automation, a convenient process flow, and simple operation, which is conducive to improving production efficiency.

[0020] 2. A support column is also provided inside the hydraulic device so that the support column can support the cylinder body and the cylinder head inside the cavity, thereby assisting in transmitting the pressure of the hydraulic equipment and preventing the cylinder body and the cylinder head from being deformed under strong pressure.

[0021] Therefore, after the above improvements, the present invention can realize a ring-shaped output hydraulic device and process, which directly drives the outer ring of the upper mold by using the ring-shaped output hydraulic device, so that it can automatically perform secondary pressing, improve its overall density, and enhance its product quality. In addition, the degree of automation is high, the process flow is convenient, the operation is simple, and it is conducive to improving production efficiency.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a cross-sectional schematic diagram of the piston rod of the present invention in a retracted state; Figure 3 It is a structural schematic diagram of the piston rod of the present invention in an extended state; Figure 4 is a cross-sectional schematic diagram of the piston rod of the present invention in an extended state; Figure 5 It is a structural schematic diagram of a cylinder body and a cylinder head of the present invention; Figure 6 It is a schematic diagram of the separation structure of the hydraulic device of the present invention; Figure 7 It is a structural schematic diagram of the piston rod and the upper die outer ring of the present invention in an initial state; Figure 8 is a cross-sectional schematic diagram of the initial state of the present invention; Fig. 9 It is a structural schematic diagram of the piston rod and the upper die outer ring of the present invention in a downward pressing state; Fig.10 It is a cross-sectional schematic diagram of the present invention in a pressed state.

[0025] The reference numerals and names in the figures are as follows: 10 cylinder body; 11 first oil inlet and outlet; 12 support column; 13 third sealing ring; 20 cylinder head; 21 second oil inlet and outlet; 22 first groove; 23 second groove; 24 first through hole; 25 fourth sealing ring; 30 first piston; 31 first sealing ring; 32 second sealing ring; 40 piston rod; 51 upper mold inner core; 52 upper mold outer ring. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] See also Figures 1 to 10In an embodiment of the present invention, a ring-type output hydraulic device includes a cylinder body 10 and a cylinder head 20 that are fixedly connected to each other and have a cavity formed inside, and also includes a first piston 30 and a piston rod 40. The first piston 30 is slidably connected inside the cavity. One end of the piston rod 40 is fixedly connected to the first piston 30, and the other end thereof extends a certain length out of the cylinder head 20 to form a free end; multiple piston rods 40 are distributed on the first piston 30 at a certain distance, thereby forming a transmission structure of multi-rod synchronous output. Multiple piston rods 40 are evenly spaced from each other, and are installed on the first piston 30 in an annular structure as a whole, thereby forming a transmission structure of multi-rod annular output.

[0028] Specifically, when using an external hydraulic press to perform compression molding on a cylindrical plastic part, it is necessary to set a cylindrical lower mold and an upper mold inner core 51, install the cylindrical lower mold on the lower plate of the hydraulic press, and install the upper mold inner core 51 on the upper plate of the hydraulic press, so as to use the strong pressure of the hydraulic press to press the upper mold inner core 51 into the interior of the cylindrical lower mold, so as to press the molten plastic loaded in the preset cavity of the cylindrical lower mold into a cylindrical plastic part. In order to press the side wall of the cylindrical plastic part, it is also necessary to set an upper mold outer ring 52 on the outer periphery of the upper mold inner core 51 so that the upper mold outer ring 52 can press the side wall of the cylindrical plastic part. In order to increase the density of the product, it is also necessary to perform secondary pressing on the side wall of the cylindrical plastic part. The traditional secondary pressing adopts the form of an additional ring, which is cumbersome to operate and inefficient.

[0029] Therefore, a hydraulic device with an annular output can be set between the upper mold inner core 51 and the upper plate of the hydraulic press, and the multiple piston rods 40 of the hydraulic device can be used to synchronously pressurize the upper mold outer ring 52. The secondary pressing can be completed without returning the upper plate of the hydraulic press. The operation is simple and the efficiency is very high.

[0030] Secondly, since the upper mold outer ring 52 is an annular component arranged around the upper mold inner core 51, and the side wall of the cylindrical plastic is also an annular side wall, in order to drive the upper mold outer ring 52 more stably, it is preferred to arrange the multiple piston rods 40 of the hydraulic device in an annular arrangement so that they are evenly spaced from each other to form an annular output transmission structure. It can be understood that this annular output transmission structure can be installed on the upper mold outer ring 52 by setting an annular mounting frame at the end of the piston rod 40. In order to simplify the structure, it is also possible not to set an annular mounting frame, but to directly install the end of the piston rod 40 on the upper mold outer ring 52. By utilizing the annular shape of the upper mold outer ring 52 itself and the synchronous output structure of multiple piston rods 40, an annular output of the upper mold outer ring 52 can be achieved.

[0031] Again, in order to stably drive the upper die outer ring 52, preferably, the number of piston rods 40 is set to three or more, so as to form a transmission structure for synchronously outputting multiple driving forces for the upper die outer ring 52. Figure 1 As shown, preferably, the number of piston rods 40 can be set to four to drive the upper mold outer ring 52 from four relative directions. Fig. 9 As shown, more piston rods 40 are provided to drive the upper die outer ring 52 in more directions.

[0032] It can be understood that the cavity inside the cylinder body 10 can form two different chambers under the division of the first piston 30, and a first oil inlet and outlet port 11 can be set on the cylinder body 10, and a second oil inlet and outlet port 21 can be set on the cylinder head 20, so that pressure oil can be injected into the two chambers or return oil can be operated, thereby realizing a two-way driving operation of the first piston 30, so that the first piston 30 can move back and forth inside the cavity and drive the piston rod 40 to do work on the external device.

[0033] In addition, corresponding grooves may be provided on the side of the cylinder body 10 or the cylinder head 20 facing the cavity, corresponding to the positions of the oil inlet and outlet ports, so that the pressure oil can flow quickly into the annular chamber.

[0034] The present invention also provides a production process, using the above hydraulic device to perform compression molding on cylindrical plastics, and the specific process includes: First, install the cylindrical lower mold on the lower plate of the hydraulic press, install the top of the cylinder body 10 of the hydraulic device on the upper plate of the hydraulic press, install the upper mold inner core 51 on the lower end of the cylinder cover 20 of the hydraulic device, and install the upper mold outer ring 52 on the piston rod 40 of the hydraulic device; then start the hydraulic press to drive the upper plate to move downward, so that the hydraulic device, the upper mold inner core 51 and the upper mold outer ring 52 move downward synchronously and are pressed into the preset cavity of the cylindrical lower mold to perform compression molding on the molten plastic in the preset cavity; then continue to maintain the position and pressure between the upper plate and the lower plate of the hydraulic press unchanged, and operate the hydraulic device to drive the upper mold outer ring 52 downward, thereby performing secondary compression on the side wall of the cylindrical plastic product.

[0035] like Figure 2 , Figure 4 , Figure 5 and Figure 6 As shown, preferably, a support column 12 is provided in the cylinder body 10, and the support column 12 is fixedly connected to the inside of the cylinder body 10, one end of which abuts against the top of the cylinder body 10, and the other end abuts against the cylinder head 20, and the space between the outer wall of the support column 12 and the inner wall of the cylinder body 10 forms a chamber for the reciprocating movement of the first piston 30.

[0036] Specifically, when the hydraulic device is installed on an external hydraulic equipment to perform hydraulic processing operations, since the top of the cylinder body 10 is connected to the upper plate of the hydraulic equipment, and the cylinder head 20 is connected to the upper mold inner core 51 of the pressing mold, it is equivalent to that the pressure of the hydraulic equipment needs to be transmitted through the cylinder body 10 and the cylinder head 20. Therefore, in order to prevent the cylinder body 10 and the cylinder head 20 from deforming under the action of strong pressure, a corresponding support column 12 can be arranged in the internal cavity of the hydraulic device, so that the support column 12 can support the cylinder body 10 and the cylinder head 20 inside the cavity, thereby assisting in transmitting the pressure of the hydraulic equipment.

[0037] like Figure 6 As shown, preferably, the first piston 30 is configured as an annular structure and is sleeved on the support column 12 so that the inner wall of the first piston 30 abuts against the outer wall of the support column 12 , and the outer wall of the first piston 30 abuts against the inner wall of the cylinder body 10 .

[0038] Specifically, in order to better cooperate with the support column 12, the first piston 30 can be set as an annular structure, and the first piston 30 and the support column 12 are coaxially arranged. This is equivalent to the first piston 30 reciprocating around the support column 12 to form a piston work structure.

[0039] like Figure 2 As shown, preferably, a first sealing ring 31 is provided between the inner wall of the first piston 30 and the outer wall of the support column 12, so that the contact portion between the two forms a sealed sliding connection; a second sealing ring 32 is provided between the outer wall of the first piston 30 and the inner wall of the cylinder body 10, so that the contact portion between the two forms a sealed sliding connection.

[0040] Specifically, the first piston 30 needs to move in the cavity of the cylinder 10, and the hydraulic oil also pushes the first piston 30 in the cavity. Therefore, it is necessary to ensure that the two cavities of the cavity are isolated from each other to avoid oil leakage. Therefore, a sealing ring can be set at the corresponding contact position to form a sealed connection.

[0041] like Figures 4 to 6 As shown, preferably, a first groove 22 is provided at the position where the cylinder head 20 abuts against the support column 12 , and one end of the support column 12 is passed through the first groove 22 , thereby forming a limit in the radial direction of the support column 12 .

[0042] Specifically, the first groove 22 can guide and limit the installation position of the support column 12, so that it can be accurately installed at a preset position of the cylinder body 10, and can prevent the support column 12 from being laterally shifted during subsequent use.

[0043] like Figure 5 and Figure 6As shown, preferably, a second groove 23 is provided at the position where the cylinder head 20 abuts against the side wall of the cylinder body 10, and one end of the side wall of the cylinder body 10 is penetrated through the second groove 23, thereby limiting the side wall of the cylinder body 10. A third sealing ring 13 is also provided at the position where the cylinder head 20 abuts against the cylinder body 10, so that the connection between the cylinder head 20 and the cylinder body 10 forms a sealed connection.

[0044] Specifically, in order to better fix the cylinder head 20, a second groove 23 can be provided on the cylinder head 20, and the side wall of the cylinder body 10 is inserted into the second groove 23, and then the bolt connection in the prior art can be used for fixing. Similarly, in order to achieve a sealing effect, a third sealing ring 13 can also be provided between the cylinder head 20 and the cylinder body 10.

[0045] like Figure 6 As shown, preferably, the cylinder head 20 is provided with a first through hole 24 at a position corresponding to the piston rod 40, one end of the piston rod 40 is passed through the first through hole 24 and extends a certain distance out of the cylinder head 20; a fourth sealing ring 25 is provided between the side wall of the first through hole 24 and the piston rod 40, so that a sealed sliding connection is formed between the piston rod 40 and the cylinder head 20.

[0046] Specifically, similarly, the piston rod 40 needs to pass through the cylinder head 20, so a first through hole 24 needs to be opened at a suitable position of the cylinder head 20, and in order to meet the corresponding sealing requirements, a corresponding fourth sealing ring 25 needs to be arranged between the piston rod 40 and the cylinder head 20. Moreover, since the piston rod 40 needs to slide along the first through hole 24, the fourth sealing ring 25 can be provided with a multi-layer sealing structure at a suitable position of the cylinder head 20, or it can be provided as Fig.10 As shown, an additional sealing device is provided at the cylinder head 20 , and a strengthened sealing treatment is performed thereon, so that a sealed sliding connection is formed between the piston rod 40 and the cylinder head 20 .

[0047] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A hydraulic device with annular output, characterized in that: The invention comprises a cylinder body (10) and a cylinder head (20) which are fixedly connected to each other and have a cavity formed therein, and a first piston (30) and a piston rod (40), wherein the first piston (30) is slidably connected to the cavity, one end of the piston rod (40) is fixedly connected to the first piston (30), and the other end thereof extends out of the cylinder head (20) by a certain length to form a free end; a plurality of piston rods (40) are distributed on the first piston (30) at a certain distance, thereby forming a transmission structure with multi-rod synchronous output.

2. A ring-shaped output hydraulic device according to claim 1, characterized in that: The plurality of piston rods (40) are evenly spaced from each other and are mounted on the first piston (30) in an annular structure as a whole, thereby forming a transmission structure with a multi-rod annular output.

3. A ring-shaped output hydraulic device according to claim 1, characterized in that: A support column (12) is provided inside the cylinder body (10). The support column (12) is fixedly connected to the inside of the cylinder body (10), one end of which abuts against the top of the cylinder body (10), and the other end of which abuts against the cylinder head (20). The space between the outer wall of the support column (12) and the inner wall of the cylinder body (10) forms a chamber for the first piston (30) to reciprocate.

4. A ring-shaped output hydraulic device according to claim 3, characterized in that: The first piston (30) is configured as an annular structure and is sleeved on the support column (12), so that the inner wall of the first piston (30) abuts against the outer wall of the support column (12), and the outer wall of the first piston (30) abuts against the inner wall of the cylinder body (10).

5. A ring-shaped output hydraulic device according to claim 3, characterized in that: A first sealing ring (31) is provided between the inner wall of the first piston (30) and the outer wall of the support column (12), so that the contacting parts of the two form a sealed sliding connection; and a second sealing ring (32) is provided between the outer wall of the first piston (30) and the inner wall of the cylinder body (10), so that the contacting parts of the two form a sealed sliding connection.

6. A ring-shaped output hydraulic device according to claim 3, characterized in that: A first groove (22) is provided at a position where the cylinder cover (20) abuts against the support column (12), and one end of the support column (12) is inserted into the first groove (22), thereby forming a limit position in the radial direction of the support column (12).

7. A ring-shaped output hydraulic device according to claim 1, characterized in that: A second groove (23) is provided at a position where the cylinder cover (20) abuts against the side wall of the cylinder body (10), and one end of the side wall of the cylinder body (10) is inserted into the second groove (23), thereby limiting the side wall of the cylinder body (10).

8. A ring-shaped output hydraulic device according to claim 1, characterized in that: A third sealing ring (13) is also provided at the position where the cylinder cover (20) abuts against the cylinder body (10), so that a sealed connection is formed at the connection between the cylinder cover (20) and the cylinder body (10).

9. A ring-shaped output hydraulic device according to claim 1, characterized in that: The cylinder cover (20) is provided with a first through hole (24) at a position corresponding to the piston rod (40); one end of the piston rod (40) is inserted into the first through hole (24) and extends a certain distance out of the cylinder cover (20); a fourth sealing ring (25) is provided between the side wall of the first through hole (24) and the piston rod (40), so that a sealed sliding connection is formed between the piston rod (40) and the cylinder cover (20).

10. A production process, characterized in that: A production method using a ring-shaped output hydraulic device according to any one of claims 1 to 9 comprises the following steps: firstly, installing a cylindrical lower mold on the lower plate of a hydraulic press, installing the top of the cylinder body (10) of the hydraulic device on the upper plate of the hydraulic press, installing the inner core (51) of the upper mold on the lower end of the cylinder cover (20) of the hydraulic device, and installing the outer ring (52) of the upper mold on the piston rod (40) of the hydraulic device; then, the hydraulic press is operated to drive the upper plate to move downward, so that the hydraulic device, the inner core (51) of the upper mold and the outer ring (52) of the upper mold are synchronously moved downward and pressed into a preset cavity of the cylindrical lower mold, so that the molten plastic in the preset cavity is subjected to compression molding; then, the position and pressure between the upper plate and the lower plate of the hydraulic press are maintained unchanged, and the hydraulic device is operated to drive the outer ring (52) of the upper mold to be pressed downward, thereby performing secondary compression on the side wall of the product.

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