Four-oil-cylinder synchronous lifting device for lower end cover of isostatic pressing machine

Abstract

The utility model discloses an isostatic press lower end cover four oil cylinder synchronous lifting device, four corners of a tool platform are respectively provided with an oil cylinder, four corners of the tool platform are respectively provided with an installation groove, an installation adjusting seat is installed in the installation groove, and one end of each oil cylinder extends into the installation groove and is connected with the installation adjusting seat. The mounting adjusting seat comprises a lifting table, a spring and an electromagnetic mechanism which are sequentially arranged from top to bottom, a magnet layer is arranged on the side, close to the electromagnetic mechanism, of the lifting table, the other side of the lifting table is connected with an oil cylinder, and the lifting table is slidably connected with the mounting groove; a rod cavity and a rodless cavity of the oil cylinder are connected with an oil inlet way and an oil return way respectively, the oil inlet way and the oil return way are connected with the proportional directional valve through hydraulic control one-way valves respectively, and a one-way balance valve is arranged at the end, close to the oil cylinder, of the oil return way. In an initial state, the displacement values of the four oil cylinders are corrected and adjusted by installing the adjusting seat; in the lifting process, the moving speed of the four oil cylinders is adjusted through the proportional reversing valves, synchronous and stable lifting of the lower end cover is achieved, and good practicability is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lifting devices for isostatic presses, and in particular relates to a four-oil-cylinder synchronous lifting device for a lower end cover of an isostatic press. Background Art

[0002] The isostatic press is a molding equipment that works under ultra-high pressure. The isostatic press uses oil, water or gas as the working medium, and applies the same ultra-high pressure in all directions to all surfaces of the object, which can make the molded workpiece have high and uniform density, uniform sintering shrinkage and easy machining. Because the container and the lower end cover adopt a floating structure, there is no connection. The frame needs to move to cover the container to bear the axial force, and the movement of the frame requires a gap to be formed between the upper and lower end covers and the frame pressure plate. The lower end cover has its own weight downward, and a cylinder is required to lift it before the frame moves to form a gap between it and the frame. At the same time, due to the large size and heavy weight of the end cover, the conventional crane in the general factory building cannot perform the lifting work when the seal is replaced, so a cylinder lifting control is required, and four cylinders are used to move synchronously to achieve this function. Utility Model Content

[0003] The utility model aims to provide a four-cylinder synchronous lifting device for the lower end cover of an isostatic press, aiming to solve the above-mentioned problems.

[0004] The utility model is mainly realized through the following technical solutions:

[0005] A four-cylinder synchronous lifting device for the lower end cover of an isostatic press comprises a tooling platform and a cylinder, wherein the four corners of the tooling platform are respectively provided with a cylinder; the four corners of the tooling platform are respectively provided with a mounting groove, in which a mounting adjustment seat is installed, one end of the cylinder extends into the mounting groove and is connected to the mounting adjustment seat; the mounting adjustment seat comprises a lifting platform, a spring and an electromagnetic mechanism which are arranged in sequence from top to bottom, a magnet layer is provided on one side of the lifting platform close to the electromagnetic mechanism, and the other side is connected to the cylinder, and the lifting platform is slidably connected to the mounting groove; the rod chamber and the rodless chamber of the cylinder are respectively connected to the oil inlet and the oil return, and the oil inlet and the oil return are respectively connected to the proportional reversing valve through a hydraulically controlled one-way valve, and a one-way balancing valve is provided on one end of the oil return close to the cylinder.

[0006] In order to better realize the utility model, further, one end of the oil cylinder is slidably connected to the installation groove, and one end of the oil cylinder slides into the installation groove and is clamped with the top of the lifting platform.

[0007] In order to better realize the utility model, further, a clamping protrusion is provided on the top of the lifting platform, and a clamping groove is correspondingly provided at one end of the oil cylinder.

[0008] In order to better realize the utility model, further, a displacement sensor is arranged on the oil cylinder, and one of the oil cylinders is a reference oil cylinder.

[0009] In order to better realize the utility model, it further includes a reference support, and the reference support is vertically arranged on the driving rod of the reference cylinder; three connecting rods are hinged at the ends of the reference support, and the free ends of the connecting rods are provided with arc grooves for the driving rods of other cylinders to pass through, displacement sensors are respectively installed on the reference support and the arc groove, and the ends of the cylinders are respectively provided with measurement reference ends.

[0010] In order to better realize the utility model, further, the connecting rod is a telescopic rod.

[0011] In order to better realize the utility model, further, a horizontal bubble meter is respectively provided on the reference support and the connecting rod.

[0012] The beneficial effects of the utility model are as follows:

[0013] When the four oil cylinders are in the initial state, the utility model collects the initial displacement value of each oil cylinder displacement sensor through PLC. In order to eliminate the error caused by the drift of the displacement sensor, the displacement values ​​of the four oil cylinders are corrected and adjusted by installing the adjustment seat so that they are all at the same displacement value. Secondly, during the lifting process, the oil circuit control of each oil cylinder is adjusted by the proportional reversing valve to make the lifting and lowering of the four oil cylinders synchronous. By adjusting the moving speed of the four oil cylinders, the displacement difference approaches 0, reaching a synchronous moving state, and realizing the synchronous and stable lifting and lowering of the lower end cover, which has good practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the connection structure between the installation platform and the oil cylinder;

[0015] Figure 2 This is a schematic diagram of the initial installation error of the oil cylinder;

[0016] Figure 3 It is a schematic diagram of the lifting error during the operation of the oil cylinder;

[0017] Figure 4 It is a schematic diagram of the connection structure between the oil cylinder and the mounting adjustment seat;

[0018] Figure 5 Schematic diagram of the connection structure between the reference support and the connecting rod.

[0019] Among them: 1-reference cylinder, 2-installation groove, 3-proportional reversing valve, 4-lifting platform, 5-magnet layer, 6-electromagnetic mechanism, 7-reference support, 8-connecting rod. DETAILED DESCRIPTION

[0020] Embodiment 1:

[0021] A four-cylinder synchronous lifting device for the lower end cover of an isostatic press comprises a tooling platform and a cylinder, wherein the four corners of the tooling platform are respectively provided with cylinders; the four corners of the tooling platform are respectively provided with mounting grooves 2, wherein mounting adjustment seats are installed in the mounting grooves 2, and one end of the cylinder extends into the mounting grooves 2 and is connected to the mounting adjustment seats; the mounting adjustment seats comprise a lifting platform 4, a spring and an electromagnetic mechanism 6 which are arranged in sequence from top to bottom, wherein a magnet layer 5 is arranged on one side of the lifting platform 4 close to the electromagnetic mechanism 6, and the other side is fixedly connected to the cylinder, and the lifting platform 4 is slidably connected to the mounting groove 2; the rod chamber and the rodless chamber of the cylinder are respectively connected to the oil inlet and the oil return, wherein the oil inlet and the oil return are respectively connected to the proportional reversing valve 3 through a hydraulically controlled one-way valve, and a one-way balancing valve is arranged on one end of the oil return near the cylinder. A displacement sensor is arranged on the cylinder, wherein one of the cylinders is a reference cylinder 1.

[0022] Preferably, one end of the oil cylinder is slidably connected to the mounting groove 2, and one end of the oil cylinder extends into the mounting groove 2 and is engaged with the top of the lifting platform 4. A locking protrusion is provided on the top of the lifting platform 4, and a locking groove is correspondingly provided at one end of the oil cylinder.

[0023] like Figure 2 As shown, when the four cylinders are in the initial state, the displacement sensor signals of each cylinder are collected through PLC, and it is assumed that one cylinder is the reference cylinder 1, and its initial state displacement value is S1, and the initial state displacement values ​​of the remaining cylinders are S2 (or S3, or S4). At the same time, in order to eliminate the error caused by the drift of the displacement sensor, the displacement values ​​of the four cylinders are corrected by installing the adjustment seat, so that they can be initially installed and corrected.

[0024] like Figure 3 As shown, when in use, the same bit value is output through the PLC to open the initial flow of each cylinder fluid proportional reversing valve 3, so that each cylinder can move with an initial speed, and during the initial movement, the reference cylinder 1 and the other cylinders form a displacement difference A1-A2.

[0025] During the rising action, if the displacement difference is greater than 0, it means that the moving speed of the reference cylinder 1 is too fast, and the moving speeds of the other cylinders are relatively slow. At this time, the flow rate of the hydraulic proportional reversing valve 3 of the reference cylinder 1 is reduced through the PLC program output control to slow down its moving speed, while the flow rate of the corresponding hydraulic proportional reversing valve 3 of the other cylinders is increased through the PLC output control to increase its moving speed, so that the four cylinders tend to move synchronously; if the displacement difference is less than 0, it means that the moving speed of the reference cylinder 1 is relatively slow, and the moving speeds of the other cylinders are relatively fast. At this time, the flow rate of the hydraulic proportional reversing valve 3 of the reference cylinder 1 is increased through the PLC program output control to speed up its moving speed; the flow rate of the hydraulic proportional reversing valve 3 of the other cylinders is reduced to slow down its moving speed, so that the four cylinders tend to move synchronously.

[0026] During the descending action, if the displacement difference is greater than 0, it means that the moving speed of the reference cylinder 1 is slow, and the moving speeds of the other cylinders are too fast; if the displacement difference is less than 0, it means that the moving speed of the reference cylinder 1 is too fast, and the moving speeds of the other cylinders are slow. As mentioned above, the flow rate of the corresponding cylinder fluid proportional reversing valve 3 is controlled through the PLC output to adjust the respective moving speeds, so that the four cylinders can move synchronously.

[0027] If the displacement difference = 0, it means that there is no displacement difference among the cylinders, and the displacement values ​​of each cylinder are equal, and they are in a completely synchronous movement state. Therefore, no matter whether the lower end cover is rising or falling, during the movement process, the flow rate of the corresponding cylinder fluid proportional reversing valve 3 is controlled to control the cylinder movement speed, so that the displacement difference between each cylinder and the reference cylinder 1 approaches zero, thereby realizing the synchronous lifting and lowering control of the four cylinders of the lower end cover.

[0028] Embodiment 2:

[0029] A four-cylinder synchronous lifting device for the lower end cover of an isostatic press, wherein four cylinders arranged in a square matrix are arranged on a mounting platform, and one of the cylinders is a reference cylinder 1. The rod chambers and rodless chambers of the four cylinders are respectively connected to an oil inlet and an oil return, and the oil inlet and the oil return are respectively connected to a proportional reversing valve 3 through a hydraulically controlled one-way valve, and a one-way balancing valve is arranged at one end of the oil return close to the cylinder.

[0030] A reference support 7 is vertically slidably installed in the middle of the driving rod of the reference oil cylinder 1, and three connecting rods 8 are respectively hinged at the ends of the reference support 7. The free ends of the connecting rods 8 are provided with arc grooves for the driving rods of other oil cylinders to pass through. Displacement sensors are respectively installed on the reference support 7 and the surrounding sides of the arc grooves; and measuring ends are respectively correspondingly provided at the ends of the oil cylinders. Preferably, the connecting rod 8 is a telescopic rod, and the reference support 7 and the connecting rod 8 are respectively provided with a horizontal bubble meter.

[0031] Since the installation position of the displacement sensor on each oil cylinder is different, the final distance measured is based on a different reference, which can easily cause a large installation error. Therefore, the present application uses the reference support 7 on the reference oil cylinder 1 as a reference, and based on oil cylinders in different orientations, the hinged connecting rod 8 is rotated and / or extended to achieve matching installation of other oil cylinders, unifying the reference of displacement measurement, improving the accuracy of distance measurement, and having good practicality.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A four-cylinder synchronous lifting device for the lower end cover of an isostatic press, characterized in that: The utility model comprises a tooling platform and an oil cylinder, wherein the four corners of the tooling platform are respectively provided with oil cylinders; the four corners of the tooling platform are respectively provided with mounting grooves (2), wherein a mounting adjustment seat is installed in the mounting groove (2), and one end of the oil cylinder extends into the mounting groove (2) and is connected to the mounting adjustment seat; the mounting adjustment seat comprises a lifting platform (4), a spring and an electromagnetic mechanism (6) which are arranged in sequence from top to bottom, wherein a magnet layer (5) is arranged on one side of the lifting platform (4) close to the electromagnetic mechanism (6), and the other side is connected to the oil cylinder, and the lifting platform (4) is slidably connected to the mounting groove (2); the rod chamber and the rodless chamber of the oil cylinder are respectively connected to the oil inlet and the oil return, wherein the oil inlet and the oil return are respectively connected to the proportional reversing valve (3) through a hydraulically controlled one-way valve, and a one-way balancing valve is arranged on one end of the oil return close to the oil cylinder.

2. The four-cylinder synchronous lifting device for the lower end cover of an isostatic press according to claim 1 is characterized in that: One end of the oil cylinder is slidably connected to the mounting groove (2), and one end of the oil cylinder slides into the mounting groove (2) and is clamped with the top of the lifting platform (4).

3. The four-cylinder synchronous lifting device for the lower end cover of an isostatic press according to claim 2 is characterized in that: A clamping protrusion is provided on the top of the lifting platform (4), and a clamping groove is correspondingly provided at one end of the oil cylinder.

4. The four-cylinder synchronous lifting device for the lower end cover of an isostatic press according to claim 1 is characterized in that: The oil cylinders are provided with displacement sensors, one of which is a reference oil cylinder (1).

5. The four-cylinder synchronous lifting device for the lower end cover of an isostatic press according to claim 4, characterized in that: It also comprises a reference support (7), the reference support (7) being vertically arranged on the driving rod of the reference oil cylinder (1); three connecting rods (8) are respectively hinged at the ends of the reference support (7), and arc grooves are provided at the free ends of the connecting rods (8) for the driving rods of other oil cylinders to pass through; displacement sensors are respectively installed on the reference support (7) and the arc grooves, and measurement reference ends are respectively correspondingly provided at the ends of the oil cylinders.

6. The four-cylinder synchronous lifting device for the lower end cover of an isostatic press according to claim 5, characterized in that: The connecting rod (8) is a telescopic rod.

7. The four-cylinder synchronous lifting device for the lower end cover of an isostatic press according to claim 5, characterized in that: The reference support (7) and the connecting rod (8) are respectively provided with a level bubble meter.

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