Dry powder forming hydraulic machine

Abstract

The utility model relates to the technical field of dry powder forming hydraulic machines, in particular to a dry powder forming hydraulic machine which comprises a lower machine frame, a movable pressure-bearing frame, a top pressing assembly, an upper cross beam and a lower pressing assembly, a working table is installed on the lower machine frame, the movable pressure-bearing frame is arranged above the working table, and a cylinder sintering furnace is arranged on the movable pressure-bearing frame. A mold frame is arranged on the inner side of the cylindrical sintering furnace, a jacking block is placed in the movable pressure-bearing frame, a jacking assembly is arranged in the lower rack in a penetrating mode, the top end of the jacking assembly penetrates into the movable pressure-bearing frame to jack up or put down the jacking block, a lower mold pressing head used for jacking up or putting down the jacking block is arranged on the jacking block, and the upper cross beam is connected with the lower rack through a plurality of guide columns. The lower pressing assembly is arranged on the upper cross beam in a penetrating mode, the pressing end of the lower pressing assembly is connected with an upper sliding frame, and the guide columns are sleeved with the upper sliding frame. The jacking mechanism of the dry powder forming hydraulic machine can jack the track to enable the track to be in butt joint with the track of the guide rail, so that the movable pressure-bearing frame can be moved into or out of the hydraulic machine, and a mold frame is convenient to install.

Description

Technical Field

[0001] The utility model belongs to the technical field of dry powder forming hydraulic presses, in particular to a dry powder forming hydraulic press. Background Art

[0002] Powder forming is a very important processing method and an advanced manufacturing technology that saves energy and materials. Dry powder hydraulic presses are usually used as processing equipment. However, when metallurgical pressing of powder is carried out by existing dry powder hydraulic presses, the mold frame needs to be lifted and placed on the workbench. However, due to the heavy mold frame, it is difficult for personnel to hold it steady, which can easily cause damage to the mold frame and even personal injury in serious cases. At the same time, existing dry powder hydraulic presses cannot maintain uniform density of the product from top to bottom during pressing, which weakens the strength of the powder metallurgy product.

[0003] The return cylinder of the existing dry powder hydraulic press has a short stroke and a large tonnage, which easily causes the return cylinder to deviate and cannot accurately guarantee the displacement and stroke data of the return cylinder. Therefore, it is urgent to design a dry powder molding hydraulic press to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a dry powder forming hydraulic press, which solves the problem that the mold frame used in the existing dry powder hydraulic press is heavy and difficult to press, resulting in damage to the mold frame and harm to personnel;

[0005] The existing dry powder hydraulic press cannot maintain uniform density of the product from top to bottom during compaction, which leads to the problem of poor strength of powder metallurgy products;

[0006] The existing dry powder hydraulic press has a large tonnage, which easily causes the return cylinder to deviate and cannot accurately guarantee the displacement and stroke data of the return cylinder.

[0007] In order to solve the above technical problems, the utility model provides a dry powder forming hydraulic press, comprising a lower frame, a movable pressure frame, a top pressure assembly, an upper crossbeam and a lower pressure assembly, wherein a workbench is installed on the lower frame, the movable pressure frame is arranged above the workbench, a cylindrical sintering furnace is provided on the movable pressure frame, a mold frame is provided inside the cylindrical sintering furnace, a top block is placed in the movable pressure frame, the top pressure assembly is inserted into the lower frame, and the top end thereof is inserted into the movable pressure frame to lift or lower the top block, and a lower die pressure head for lifting or lowering the top block is provided on the top block.

[0008] The upper crossbeam and the lower frame are connected by a plurality of guide pillars. The lower pressing assembly is arranged on the upper crossbeam, and the pressing end thereof is connected to an upper slide. The upper slide is sleeved on the plurality of guide pillars and is slidably connected thereto. The bottom of the upper slide is connected to an upper die pressing head.

[0009] A guide rail is fixedly provided on one side of the workbench, and two groups of symmetrically arranged lifting mechanisms are passed through the workbench. The output end of each group of the lifting mechanisms is correspondingly connected to a track. The lifting mechanism is used to lift or lower the track, and the movable pressure frame slides on the track and the guide rail through a transmission device.

[0010] Furthermore, the pressing assembly includes a fourth fixing seat, a master cylinder, a plunger rod, a hydraulic locking cylinder and a connecting plate. The fourth fixing seat is passed through the upper crossbeam, the master cylinder is passed through the top of the fourth fixing seat, and its output end extends into the fourth fixing seat. The plunger rod is a hollow structure, and the plunger rod is arranged in the fourth fixing seat. There are at least two hydraulic locking cylinders, and the number is even. The hydraulic locking cylinders are symmetrically arranged on both sides of the master cylinder, and the tops thereof are fixedly arranged at the bottom of the upper crossbeam. The output end of the hydraulic locking cylinder is connected to the connecting plate.

[0011] The connecting seat is embedded in the lower part of the plunger rod, the connecting plate is fixedly connected to the plunger rod by a fastener, and the connecting seat is pressed tightly, the connecting plate is fixedly connected to the upper slide, and a second guide rod is passed through the connecting seat, and the lower end of the second guide rod passes through the connecting plate and is connected to the inner bottom surface of the upper slide.

[0012] A ring plate is embedded on the lower inner wall of the fourth fixing seat. The ring plate is pressed into the fourth fixing seat through a third pressing plate and a fastener, and the inner wall of the ring plate is slidably connected to the plunger rod.

[0013] Furthermore, the transmission device includes a reducer, a transmission shaft, a driving wheel and a driven wheel. The reducer is fixedly arranged on the inner plate of the mobile pressure-bearing frame, and its output end is connected to the first gear. The transmission shaft has two, and is respectively passed through the two ends of the mobile pressure-bearing frame. A second gear is sleeved on the transmission shaft close to the guide rail, and the second gear is engaged with the first gear. There are two driving wheels, and they are respectively sleeved on the two ends of the transmission shaft. There are two driven wheels, and they are respectively sleeved on the two ends of the transmission shaft.

[0014] Furthermore, the top end of each group of the lifting mechanisms is connected to a support, and each of the rails is fixedly arranged on each support, and the rails are used for the sliding of the driving wheel and the driven wheel;

[0015] Each group of the lifting mechanisms includes at least two lifting components, and each of the lifting components includes a pull rod, a first fixed seat and a first hydraulic cylinder. The pull rod is passed through the middle transverse bracket of the lower frame, the first fixed seat is passed through the upper transverse bracket of the lower frame, and its bottom is connected to the pull rod, the first hydraulic cylinder is pressed into the upper part of the first fixed seat by a first pressure plate and a fastener, and its output end is fixedly connected to the corresponding support.

[0016] Furthermore, a plurality of first through holes for installing the jacking mechanism are provided at the bottom of the lower frame.

[0017] Furthermore, a return cylinder is mounted on the lower frame via a third fixing seat, and the return cylinder is located between the two guide columns on the same side.

[0018] Furthermore, the lower frame is provided with anchor connecting rods on all four sides.

[0019] The cam is connected with the hydraulic cylinder of the hydraulic cylinder to form a circle, and the hydraulic cylinder is connected with the hydraulic cylinder to form a circle.

[0020] Furthermore, a plurality of first sealing rings are provided between the upper portion of the push column and the guide sleeve, and a plurality of second sealing rings are provided between the lower portion and the inner cavity of the push cylinder body.

[0021] Furthermore, a third through hole is provided on the top of the lower frame for allowing the top column to be extended and retracted, and a fourth through hole is provided on the movable pressure-bearing frame for allowing the top column to be extended and retracted. The top block is placed in the fourth through hole, and the center line of the fourth through hole is on the same axis as the center line of the third through hole.

[0022] The beneficial effects of the utility model are as follows: the jacking mechanism of the dry powder forming hydraulic press of the utility model can jack up the track, so that the track and the guide rail are connected, so that the movable pressure-bearing frame can slide on the track and the guide rail under the drive of the transmission device, thereby the movable pressure-bearing frame can be moved into or out of the hydraulic press, so as to facilitate the installation of the mold frame, effectively avoiding the problem of damage to the mold frame and harm to personnel;

[0023] The design of the jacking mechanism enables each first hydraulic cylinder to raise or lower the track on the drive support, so that the track contacts or separates with the driving wheel and the driven wheel. When in contact, the driving wheel and the driven wheel roll on the track driven by the reducer, the first gear and the second gear. After separation, the movable pressure frame is clamped between the two ends of the workbench by two sets of inclined wedge-type clamping cylinders to stabilize the movable pressure frame and improve the stability of the hydraulic press.

[0024] The design of the down-pressing assembly and the top-pressing assembly enables the master cylinder to push the plunger rod downward to push the connecting plate downward, and at the same time, the hydraulic locking cylinders on both sides of the master cylinder also move downward with the connecting plate. When the connecting plate is in contact with the inner bottom surface of the upper slide along the second guide rod, the master cylinder continues to push the upper slide downward, thereby driving the upper die pressing head downward. In addition, the filling valve of the top-pressing assembly pushes the ejector column upward, and the ejector column continues to push the ejector block upward. The ejector block and the return cylinder move upward at the same time to push the lower die pressing head upward. The upper die pressing head and the lower die pressing head float and press simultaneously to increase the density of the metallurgical product and improve the strength of the product.

[0025] The design of a lower limit device connected to the bottom of the first guide rod can effectively limit the lower limit of the first guide rod. At the same time, a displacement sensor can be installed on the lower limit device to determine the extended position of the first guide rod and the ejector column. That is, the running position and stroke displacement of the ejector column and the ejector block can be effectively sensed and controlled, and the stroke of the ram on the lower die head can be randomly controlled during sintering in the cylindrical sintering furnace;

[0026] The design of the hydraulic locking cylinder effectively fixes the upper slide by means of its own latch locking method, so as to realize the reset function of the upper slide. It can also effectively prevent the upper slide from suddenly sliding due to accidental leakage of the lower chamber of the main cylinder when installing the lower die head, upper die head or resetting the upper slide, thereby effectively improving the safety performance of the hydraulic press.

[0027] The separate design of the top block and the top column allows the top block to move in and out with the mobile pressure frame without being interfered with by the fixed position of the top column. The top block has a stepped structure, which can effectively prevent the risk of the top block falling. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. 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 any creative work.

[0029] Figure 1 This is the main view of a dry powder forming hydraulic press of the utility model;

[0030] Figure 2 This is a cross-sectional view of a dry powder forming hydraulic press of the present invention, cut through the middle of the return cylinder;

[0031] Figure 3 This is a partial fracture cross-sectional view of a dry powder forming hydraulic press of the present utility model;

[0032] In the figure: 1-lower frame, 2-movable pressure frame, 3-top pressure assembly, 4-upper beam, 5-lower pressure assembly, 6-workbench, 7-guide rail, 8-lifting mechanism, 9-track, 10-transmission device, guide column, 12-upper slide, 13-support, 16-third fixed seat, 17-return cylinder, 18-ground connection rod, 19-first sealing ring, 20-second sealing ring, 112-third through hole, 21-top block, 31-top cylinder body, 32-liquid filling valve, 33-top column, 34-first guide rod, 35-fixed plate, 36-guide Sleeve, 37-oil plug, 38-second pressure plate, 51-fourth fixed seat, 52-master cylinder, 53-plunger rod, 54-hydraulic locking cylinder, 55-connecting plate, 56-connecting seat, 57-second guide rod, 58-ring plate, 59-third pressure plate, 81-pull rod, 82-first fixed seat, 83-first hydraulic cylinder, 84-first pressure plate, 101-reducer, 102-transmission shaft, 103-driving wheel, 104-driven wheel, 105-first gear, 106-second gear, 111-first through hole, 311-second through hole. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings of the present invention specification to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the embodiments described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the utility model.

[0034] In a specific embodiment of the present invention, Figure 1-Figure 3As shown, a dry powder molding hydraulic press is specifically disclosed, including a lower frame 1, a movable pressure frame 2, a top pressure assembly 3, an upper crossbeam 4 and a lower pressure assembly 5. A workbench 6 is installed on the lower frame 1, and the movable pressure frame 2 is arranged above the workbench 6. Two groups of inclined wedge-type clamping cylinders for fixing the movable pressure frame 2 are provided on the workbench 6. The two groups of inclined wedge-type clamping cylinders are symmetrically arranged on both sides of the movable pressure frame 2. A lower die pressing head is installed in the center of the movable pressure frame 2, and an upper die pressing head is provided above the lower die pressing head. When pressing, the upper die pressing head, the lower die pressing head and the product are all located in the cylindrical sintering furnace and are heated by the cylindrical sintering furnace. A top block 21 is placed in the movable pressure frame 2, and the top pressure assembly 3 is penetrated in the lower frame 1, and its top end penetrates into the movable pressure frame 2 to lift or lower the top block 21, so as to lift or lower the lower die pressing head.

[0035] The outer sides of the workbench 6 and the upper slide 12 both protrude from the upper crossbeam 4 , and the base of the cylindrical sintering furnace is connected to the upper plane of the protruding portion of the workbench 6 by screws.

[0036] The upper crossbeam 4 and the lower frame 1 are connected by a plurality of guide pillars 11. The lower pressing assembly 5 is provided on the upper crossbeam 4, and its pressing end is connected to the upper slide 12. The upper slide 12 is sleeved on the plurality of guide pillars 11 and is slidably connected thereto. The bottom of the upper slide 12 is connected to the upper die pressing head, which is cylindrical and the lower die pressing head is cylindrical.

[0037] A guide rail 7 is fixedly provided on one side of the workbench 6. Two sets of symmetrically arranged lifting mechanisms 8 are provided inside the workbench 6. The output ends of each set of lifting mechanisms 8 are correspondingly connected to a track 9. The lifting mechanisms 8 are used to lift or lower the track 9 so that the track 9 and the guide rail 7 are docked or staggered. The mobile pressure frame 2 slides on the track 9 and the guide rail 7 through the transmission device 10.

[0038] The lifting mechanism 8 of the above-mentioned dry powder molding hydraulic press can lift the track 9, so that the track 9 and the guide rail 7 are docked, so that the mobile pressure frame 2 can slide on the track 9 and the guide rail 7 under the drive of the transmission device 10, thereby moving the mobile pressure frame 2 into or out of the hydraulic press to facilitate the installation of the mold frame, effectively avoiding damage to the mold frame and harm to personnel.

[0039] The pressing assembly 5 includes a fourth fixing seat 51, a master cylinder 52, a plunger rod 53, a hydraulic locking cylinder 54 and a connecting plate 55. The fourth fixing seat 51 is penetrated on the upper crossbeam 4, the master cylinder 52 is penetrated on the top of the fourth fixing seat 51, and its output end extends into the fourth fixing seat 51. The plunger rod 53 is a hollow structure and is arranged in the fourth fixing seat 51. There are at least two hydraulic locking cylinders 54, and the number is even. The hydraulic locking cylinders 54 are symmetrically arranged on both sides of the master cylinder 52, and the tops thereof are fixedly arranged on the bottom of the upper crossbeam 4. The output ends of the hydraulic locking cylinders 54 are connected to the connecting plate 55.

[0040] The connecting seat 56 is embedded in the lower part of the plunger rod 53. The connecting plate 55 is fixedly connected to the plunger rod 53 by a fastener and presses the connecting seat 56. The connecting plate 55 is fixedly connected to the upper slide 12. A second guide rod 57 is passed through the connecting seat 56. The lower end of the second guide rod 57 passes through the connecting plate 55 and is connected to the inner bottom surface of the upper slide 12.

[0041] A ring plate 58 is embedded on the lower inner wall of the fourth fixing seat 51 . The ring plate 58 is pressed into the fourth fixing seat 51 through a third pressing plate 59 and fasteners. The inner wall of the ring plate 58 is slidably connected to the plunger rod 53 .

[0042] The transmission device 10 includes a reducer 101, a transmission shaft 102, a driving wheel 103 and a driven wheel 104. The reducer 101 is fixedly arranged on the inner side plate of the mobile pressure-bearing frame 2, and its output end is connected to the first gear 105. There are two transmission shafts 102, which are respectively passed through the two ends of the mobile pressure-bearing frame 2. A second gear 106 is sleeved on the transmission shaft 102 close to the guide rail 7, and the second gear 106 is engaged with the first gear 105. There are two driving wheels 103, which are respectively sleeved on the two ends of the transmission shaft 102. There are two driven wheels 104, which are respectively sleeved on the two ends of the transmission shaft 102.

[0043] The top of each lifting mechanism 8 is connected to a support 13, and each track 9 is fixedly arranged on each support 13. The track 9 is used for the sliding of the driving wheel 103 and the driven wheel 104;

[0044] The bottom of the lower frame 1 is provided with a plurality of first through holes 111 for installing the jacking mechanism 8. Each group of the jacking mechanism 8 includes at least two jacking assemblies, each of which includes a pull rod 81, a first fixing seat 82 and a first hydraulic cylinder 83. The pull rod 81 is passed through the middle transverse bracket of the lower frame 1, and the first fixing seat 82 is passed through the upper transverse bracket of the lower frame 1, and its bottom is connected to the pull rod 81. The first hydraulic cylinder 83 is pressed into the upper part of the first fixing seat 82 by the first pressure plate 84 and the fastener, and its output end is fixedly connected to the corresponding support 13. In this embodiment, the first hydraulic cylinder 83 is preferably a floating cylinder;

[0045] The design of the above-mentioned lifting mechanism 8 enables each first hydraulic cylinder 83 to drive the track 9 on the support 13 to rise or fall, so that the track 9 contacts or separates with the driving wheel 103 and the driven wheel 104. When in contact, the driving wheel 103 and the driven wheel 104 roll on the track 9 driven by the reducer 101, the first gear 105 and the second gear 106. After separation, the mobile pressure frame 2 is clamped between the two ends of the workbench 6 by two sets of inclined wedge-type clamping cylinders to stabilize the mobile pressure frame 2 and improve the stability of the hydraulic press.

[0046] The lower frame 1 is mounted with a return cylinder 17 via a third fixing base 16. The return cylinder 17 is located between the two guide pillars 11 on the same side. Ground connection rods 18 are provided on all sides of the lower frame 1. The piston rod and piston head of the return cylinder 17 are an integral structure. The piston head and the inner hole of the cylinder body are sealed with a combination of a Gly ring and a guide belt to solve the problem of severe wear of the existing return cylinder 17.

[0047] The return cylinder 17 is provided with a ball joint structure. The concave spherical pad at the upper end is connected to the bottom plane of the upper slide 12 by an inverted flange, and the center of the convex spherical pad at the lower end is connected to the upper plane of the plunger rod of the return cylinder 17 by a large clearance countersunk hexagon socket screw.

[0048] The top pressure assembly 3 includes a top cylinder body 31, a filling valve 32, a top column 33 and a first guide rod 34. The top cylinder body 31 is installed in the lower frame 1 through a number of fixing plates 35. There are several filling valves 32. The bottom of the top cylinder body 31 is provided with a number of second through holes 311 for filling the filling valve 32 with liquid. The second through holes 311 are connected to the inner cavity of the top cylinder body 31. The top column 33 is arranged in the inner cavity of the top cylinder body 31. The top column 33 is not connected to the top block 21 and is a split structure. It can enable the top block 21 to move in and out with the mobile pressure frame 2 without being disturbed by the fixed position of the top column 33. The top block 21 has a stepped structure, which can effectively prevent the risk of the top block 21 falling.

[0049] A first guide rod 34 extends through the bottom of the top cylinder body 31, with its top extending into the inner cavity of the top cylinder body 31 and connected to the top column 33. The bottom of the first guide rod 34 is connected to a lower travel limit device, which is equipped with a displacement sensor. The lower travel limit device is not shown in the accompanying drawings. The lower travel limit device is mounted on the first guide rod 34 via a cantilever, and the displacement sensor is mounted on the cantilever. A self-aligning bearing is installed between the center of the cantilever and the outer wall of the first guide rod 34. When the first guide rod 34 rotates due to external force, the cantilever, guided by the dual guide rods on both sides of the cantilever, can always move in a straight line up and down without rotating, effectively ensuring the control accuracy of the displacement sensor.

[0050] The displacement sensor is connected to the control unit to monitor the displacement and operating position of the first guide rod 34 and the top column 33 in real time. A guide sleeve 36 is embedded in the upper inner wall of the top cylinder body 31, and the upper end of the top column 33 is passed through the guide sleeve 36. An oil plug 37 for controlling the flow of hydraulic oil in the inner cavity of the top cylinder body 31 is passed through the side wall of the top cylinder body 31. The guide sleeve 36 is fixed in the inner cavity of the top cylinder body 31 by the second pressure plate 38 and fasteners. The setting of the oil plug 37 can drain the hydraulic oil above the top cylinder body 31, thereby effectively preventing the top cylinder from shaking.

[0051] The design of the down-pressing assembly 5 and the top-pressing assembly 3 allows the master cylinder 52 to push the plunger rod 53 downward to push the connecting plate 55 downward, and at the same time, the hydraulic locking cylinders 54 on both sides of the master cylinder 52 also move downward with the connecting plate 55. When the connecting plate 55 is in contact with the inner bottom surface of the upper slide 12 along the second guide rod 57, the master cylinder 52 continues to push the upper slide 12 downward, thereby driving the upper die pressing head downward, and at the same time, the filling valve 32 of the top-pressing assembly 3 pushes the ejector column 33 upward. When the cylindrical sintering furnace is heated up, the upper die head cooperates with the inner cavity of the cylindrical sintering furnace under the driving force of the lower pressure component 3, and at the same time performs a process action cycle with the lower die head in the cylindrical sintering furnace, thereby improving the density of metallurgical products and improving the quality and performance of products.

[0052] A plurality of first sealing rings 19 are provided between the upper portion of the top column 33 and the guide sleeve 36 , and a plurality of second sealing rings 20 are provided between the lower portion and the inner cavity of the top cylinder body 31 .

[0053] A third through hole 112 is provided on the top of the lower frame 1 for the extension and retraction of the top column 33, and a fourth through hole is provided on the movable pressure-bearing frame 2 for the extension and retraction of the top column 33. A top block 21 is placed in the fourth through hole, and the center line of the fourth through hole is on the same axis as the center line of the third through hole 112.

[0054] The workflow of this utility model:

[0055] The upper die pressing head is installed at the bottom of the upper slide 12. When the cylindrical sintering furnace and the lower die pressing head need to be installed on the movable pressure frame 2 or the mold cavity needs to be filled with powder, the two sets of inclined wedge-type clamping cylinders on both sides of the movable pressure frame 2 on the workbench 6 are loosened, and the first hydraulic cylinder 83 of each lifting assembly is opened to extend it upward to push the support 13 and the track 9 on the support 13 to move upward so that the track 9 is docked with the track on the guide rail 7. At this time, the movable pressure frame 2 is dragged up by the first hydraulic cylinder 83, and at the same time, the driving wheel 103 and the driven wheel 104 of the transmission device 10 are both located in the track 9, the reducer 101 of the transmission device 10 is started, and the reducer 101 rotates forward to drive the first gear 105 to rotate, thereby driving the second gear 106 to rotate synchronously. When the first gear 105 is rotated, the driving wheel 103 rolls from the track 9 to the track of the guide rail 7 under the rotational force of the second gear 106, so as to drive the driven wheel 104 to move into the track of the guide rail 7. At this time, the cylindrical sintering furnace and the mold frame are installed on the movable pressure frame 2. After the installation is completed, the reducer 101 is reversed to drive the first gear 105 to rotate, so as to drive the second gear 106 to rotate at the same time. The driving wheel 103 rolls from the track of the guide rail 7 to the track 9 under the rotational force of the second gear 106. After it is in place, the first hydraulic cylinder 83 of each lifting assembly retracts downward, and the movable pressure frame 2 falls onto the workbench 6, and then the two sets of inclined wedge clamping cylinders on both sides of the movable pressure frame 2 on the workbench 6 are locked to fix the movable pressure frame 2.

[0056] During floating pressing, the main cylinder 52 of the lower pressing assembly 5 pushes the plunger rod 53 downward to push the connecting plate 55 downward, and at the same time, the connecting plate at the lower end of each hydraulic locking cylinder 54 on both sides of the main cylinder 52 disengages from the pin on itself and moves downward with the connecting plate 55. When the connecting plate 55 moves downward with the second guide rod 57 until it is in contact with the inner bottom surface of the upper slide 12, the main cylinder 52 continues to move downward to push the connecting plate 55 and the upper slide 12 downward at the same time, so as to drive the upper die pressing head to move downward into the cylindrical sintering furnace; at the same time, the filling valve 32 of the top pressing assembly 3 fills the inner cavity of the top cylinder body 31 with hydraulic oil through the second through hole 311, and the hydraulic oil pushes the top column 33 upward, and the first guide rod 34 at the bottom of the top column 33 moves upward with the top column 33, so that it can move along the top cylinder body 3 1, the hole at the bottom moves upward, and the upper end of the ejector column 33 extends into the movable pressure frame 2 to push the ejector block 21 upward. The ejector block 21 lifts the lower die head under the driving force of the hydraulic oil. When the hydraulic oil pushes the ejector column 33 upward, the displacement sensor on the lower limit device sends the displacement data of the first guide rod 34 to the control unit so that the position of the ejector column 33 can be monitored in real time. The upper die head and the lower die head cooperate to press in the cylindrical sintering furnace under the driving force of the lower pressing component 5 and the ejector component 3. The ejector column 33 is lifted to the set position (so that the upper plane of the upper die head is flush with the upper plane of the die cavity). The upper die head presses down and drives the lower die head to move powder synchronously. At this time, the lower cavity of the top cylinder body 31 is in a reverse back pressure state, so that the density of the powder is uniform, realizing the floating pressing process of the hydraulic press.

[0057] When the first guide rod 34 moves downward to the set position of the displacement sensor through floating pressing, the upper and lower rams pressurize the powder simultaneously, thus achieving bidirectional pressing.

[0058] When both the upper and lower pressures reach the set pressure of the pressure sensor, the hydraulic press will carry out a ten-hour heat preservation and pressure maintenance process (pump on to maintain pressure) to achieve further condensation and solidification of the product to improve the stability of the internal structure.

[0059] Start the pump to maintain pressure: When the upper cavity of the master cylinder 52 and the inner cavity of the top cylinder body 31 are in the process of maintaining pressure, if the pressure setting value drops by 1MPa due to hydraulic oil leakage, the pressure sensor sends a signal, and the two small-flow high-pressure pumps of the servo system start instantaneously to replenish the pressure and restore it to the pressure setting value, so that the pressure fluctuation value of the upper and lower cylinders is always controlled within ±1MPa.

[0060] After the heat preservation and pressure holding is completed, the time relay sends a signal to control the main cylinder 52 and the top cylinder body 31 to release the pressure at the same time, and the return cylinder 17 pushes the upper slide 12 back to the upper limit position. When the connecting plate 55 is upward and connected with the pins at the lower end of each hydraulic locking cylinder 54 on both sides of the main cylinder 52, the upper slide 12 is locked to complete the reset and locking of the upper slide 12 and prepare for demoulding;

[0061] The push block 21, driven by the hydraulic oil, lifts the lower die head to release the mold. The ejector cylinder retracts, and the filling valve 32 returns the oil in the inner cavity of the ejector cylinder body 31 to the oil tank. The ejector column 33 descends rapidly when the hydraulic oil is withdrawn, driving the lower die head downward and causing the ejector block 21 to fall onto the movable pressure frame 2.

[0062] Finally, the two groups of inclined wedge-type clamping cylinders on both sides of the movable pressure frame 2 on the workbench 6 are loosened, the first hydraulic cylinder 83 is lifted, and the movable pressure frame 2 is moved out of the main machine under the drive of the reducer 101 to remove the parts.

[0063] After the collection is completed, powder is added to prepare for the next cycle.

[0064] At the same time, when installing the upper die pressing head, the upper slide 12 can also be locked by the pin locking method of the hydraulic locking cylinder 54 to prevent the upper slide 12 from suddenly sliding down when installing the upper die pressing head and causing casualties.

[0065] The above disclosure is only a preferred embodiment of the present invention and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A dry powder forming hydraulic press, characterized in that: The invention comprises a lower frame (1), a movable pressure frame (2), a pressing assembly (3), an upper crossbeam (4) and a lower pressing assembly (5); a workbench (6) is installed on the lower frame (1); the movable pressure frame (2) is arranged above the workbench (6); a cylindrical sintering furnace is provided on the movable pressure frame (2); a die frame is provided inside the cylindrical sintering furnace; a top block (21) is placed inside the movable pressure frame (2); the pressing assembly (3) is inserted into the lower frame (1), and its top end is inserted into the movable pressure frame (2) to lift or lower the top block (21); a lower die head for lifting or lowering the top block (21) is provided on the top block (21); The upper crossbeam (4) and the lower frame (1) are connected via a plurality of guide posts (11); the lower pressing assembly (5) is arranged on the upper crossbeam (4), and its pressing end is connected to an upper slide (12); the upper slide (12) is sleeved on the plurality of guide posts (11) and is slidably connected thereto; the bottom of the upper slide (12) is connected to an upper die pressing head; A guide rail (7) is fixedly provided on one side of the workbench (6), and two groups of symmetrically arranged lifting mechanisms (8) are provided inside the workbench (6). The output end of each group of the lifting mechanisms (8) is correspondingly connected to a track (9). The lifting mechanisms (8) are used to lift up or lower the track (9), and the movable pressure frame (2) slides on the track (9) and the guide rail (7) through a transmission device (10).

2. A dry powder forming hydraulic press according to claim 1, characterized in that: The pressing assembly (5) includes a fourth fixing seat (51), a master cylinder (52), a plunger rod (53), a hydraulic locking cylinder (54) and a connecting plate (55). The fourth fixing seat (51) is passed through the upper crossbeam (4). The master cylinder (52) is passed through the top of the fourth fixing seat (51), and its output end extends into the fourth fixing seat (51). The plunger rod (53) is a hollow structure. The plunger rod (53) is arranged in the fourth fixing seat (51). There are at least two hydraulic locking cylinders (54), and the number is even. The hydraulic locking cylinders (54) are symmetrically arranged on both sides of the master cylinder (52), and the tops of the hydraulic locking cylinders are fixedly arranged at the bottom of the upper crossbeam (4). The output end of the hydraulic locking cylinder (54) is connected to the connecting plate (55). The connecting seat (56) is embedded in the lower part of the plunger rod (53), the connecting plate (55) is fixedly connected to the plunger rod (53) by a fastener, and the connecting seat (56) is pressed tightly, the connecting plate (55) is fixedly connected to the upper slide (12), and a second guide rod (57) is passed through the connecting seat (56), and the lower end of the second guide rod (57) passes through the connecting plate (55) and is connected to the inner bottom surface of the upper slide (12). A ring plate (58) is embedded on the lower inner wall of the fourth fixing seat (51). The ring plate (58) is pressed into the fourth fixing seat (51) through a third pressing plate (59) and a fastener, and the inner wall of the ring plate (58) is slidably connected to the plunger rod (53).

3. A dry powder forming hydraulic press according to claim 1, characterized in that: The transmission device (10) comprises a reducer (101), a transmission shaft (102), a driving wheel (103) and a driven wheel (104); the reducer (101) is fixedly arranged on the inner side plate of the movable pressure-bearing frame (2), and its output end is connected to a first gear (105); the transmission shaft (102) has two, and is respectively passed through the two ends of the movable pressure-bearing frame (2); a second gear (106) is sleeved on the transmission shaft (102) near the guide rail (7); the second gear (106) is engaged with the first gear (105); the driving wheels (103) are two, and are respectively sleeved on the two ends of the transmission shaft (102); the driven wheels (104) are two, and are respectively sleeved on the two ends of the transmission shaft (102).

4. A dry powder forming hydraulic press according to claim 3, characterized in that: The top end of each group of the lifting mechanisms (8) is connected to a support (13), and each of the rails (9) is fixedly arranged on each support (13), and the rails (9) are used for the sliding of the driving wheel (103) and the driven wheel (104); Each group of the lifting mechanism (8) includes at least two lifting components, and each of the lifting components includes a pull rod (81), a first fixed seat (82) and a first hydraulic cylinder (83). The pull rod (81) is passed through the middle transverse bracket of the lower frame (1), the first fixed seat (82) is passed through the upper transverse bracket of the lower frame (1), and its bottom is connected to the pull rod (81). The first hydraulic cylinder (83) is pressed into the upper part of the first fixed seat (82) through a first pressure plate (84) and a fastener, and its output end is fixedly connected to the corresponding support (13).

5. The dry powder forming hydraulic press according to claim 1, characterized in that: The bottom of the lower frame (1) is provided with a plurality of first through holes (111) for installing the jacking mechanism (8).

6. The dry powder forming hydraulic press according to claim 1, characterized in that: The lower frame (1) is mounted with a return cylinder (17) via a third fixing seat (16), and the return cylinder (17) is located between the two guide pillars (11) on the same side.

7. The dry powder forming hydraulic press according to claim 1, characterized in that: Ground connection rods (18) are provided on all four sides of the lower frame (1).

8. The dry powder forming hydraulic press according to claim 1, characterized in that: The top pressure assembly (3) includes a top cylinder body (31), a filling valve (32), a top column (33) and a first guide rod (34). The top cylinder body (31) is installed in the lower frame (1) through a plurality of fixing plates (35). The filling valve (32) has a plurality of second through holes (311) for filling the filling valve (32) with liquid are opened at the bottom of the top cylinder body (31). The second through holes (311) are communicated with the inner cavity of the top cylinder body (31). The top column (33) is arranged in the inner cavity of the top cylinder body (31). The first guide rod (34) is passed through the top cylinder body (31). The bottom of the first guide rod (34) is connected to the inner cavity of the top cylinder body (31) and the top thereof extends into the inner cavity of the top cylinder body (31) and is connected to the top column (33). The bottom of the first guide rod (34) is connected to a lower limit device, and a displacement sensor is provided on the lower limit device. A guide sleeve (36) is embedded in the upper inner cavity wall of the top cylinder body (31). The upper end of the top column (33) is passed through the guide sleeve (36). An oil plug (37) for controlling the flow of hydraulic oil in the inner cavity of the top cylinder body (31) is passed through the side wall of the top cylinder body (31). The guide sleeve (36) is fixed in the inner cavity of the top cylinder body (31) through a second pressure plate (38) and fasteners.

9. The dry powder forming hydraulic press according to claim 8, characterized in that: A plurality of first sealing rings (19) are provided between the upper portion of the top column (33) and the guide sleeve (36), and a plurality of second sealing rings (20) are provided between the lower portion and the inner cavity of the top cylinder body (31).

10. The dry powder forming hydraulic press according to claim 8, characterized in that: A third through hole (112) is provided on the top of the lower frame (1) for allowing the top column (33) to be extended and retracted, and a fourth through hole is provided on the movable pressure-bearing frame (2) for allowing the top column (33) to be extended and retracted. The top block (21) is placed in the fourth through hole, and the center line of the fourth through hole and the center line of the third through hole (112) are on the same axis.

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