A rear mold device of a direct press

Abstract

The present invention discloses a rear mold device for a straight press, wherein a high-pressure mold locking cylinder cover is mounted on the end face of a tail plate, and a seal is formed between the high-pressure mold locking cylinder cover and the tail plate, one end of the high-pressure mold locking cylinder piston slides in the tail plate, and the other end of the high-pressure mold locking cylinder piston slides in the high-pressure mold locking cylinder cover, a plurality of support guide assemblies are axially mounted on the step surface of the tail plate, a guide hole corresponding to the support guide assembly is provided on the high-pressure mold locking cylinder cover, and the other end of the support guide assembly always slides in the guide hole, and a mold moving assembly capable of axial extension and contraction is also mounted in the high-pressure mold locking cylinder piston. The beneficial effects of the present invention are: effective transmission and decomposition of periodically uneven heavy impact loads, reduced bearing capacity of the first wear-resistant ring and the second wear-resistant ring, extended service life of the first wear-resistant ring and the second wear-resistant ring, greatly extended interval time for major maintenance, and avoided direct economic losses caused by shutdown for major maintenance.

Description

Technical Field

[0001] The invention relates to an injection molding straight press, in particular to a rear mold device of the straight press. Background Art

[0002] The clamping structure of a hinged injection molding machine applies uneven force to the mold plate, causing the plate to bend after the force is broken down. Under conditions of high injection pressure and high clamping force, the plate plate will bend and deform over time, severely impacting its service life. This deformation of the plate plate will ultimately affect the mold, further impacting its lifespan. The low-pressure mold protection zone is very close to the amplification zone of the hinge force, resulting in poor reliability of the low-pressure mold protection.

[0003] Unlike hinged injection molding machines, direct-pressure injection molding machines utilize a central axial force applied to the mold platen, significantly reducing the tendency for the mold platen to bend and deform. This ensures balanced force across the mold, resulting in a uniform, stable product. Direct-pressure machines offer high mold platen parallelism and excellent precision retention, even after repeated assembly and disassembly. The clamping force is adjustable throughout the entire process, eliminating the need for hinged force amplification, resulting in more stable and reliable low-pressure mold maintenance.

[0004] In the preform industry, dedicated high-speed direct presses typically operate 24 / 7. Typically, the press's high-pressure clamping device will leak oil within two years of continuous use, necessitating one or two maintenance shutdowns per year. However, this leakage has yet to be effectively addressed. This requires major maintenance every two years, during which the wear rings supporting the pistons in the high-pressure clamping cylinders of conventional direct presses must be replaced. Due to the unique structural design of direct presses, replacing these rings requires disassembling the entire machine and hoisting the entire tailgate assembly to the ground or platform for further disassembly. Replacing the rings on the equipment frame is not feasible. Due to the large number of disassembled parts, reassembly requires significant time and labor, severely impacting production. This can cause production downtime of a week or more, resulting in significant financial losses for the company. Therefore, oil leakage from the high-pressure clamping device has become a pressing technical issue for direct presses.

[0005] The inventor studied the disassembled wear-resistant ring and found that the main reason for the oil leakage of the high-pressure clamping device was the serious wear of the wear-resistant ring, which in turn led to a decrease in the sealing performance of the oil chamber. Then, by replacing the high-performance wear-resistant ring, oil leakage still occurred, but the time of oil leakage was postponed to the back by a few months, and the oil leakage phenomenon of the direct press was still not solved. The inventor studied why the direct press would cause damage to the wear-resistant ring and found that the wear-resistant ring was unevenly circumvented during use, resulting in stress concentration in local areas. The main reason for this is: the high-pressure clamping cylinder, the high-pressure clamping cylinder piston and the high-pressure clamping cylinder head are heavy. During the assembly process, affected by the assembly process and assembly capacity, the bearing capacity of the wear-resistant ring of the clamping device is unevenly distributed during use, which makes the local stress concentration of the wear-resistant ring of the high-pressure clamping device during long-term use, resulting in damage, resulting in oil leakage. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a rear mold device for a straight press.

[0007] The purpose of the present invention is achieved through the following technical solutions: a rear mold device of a straight press, comprising a tail plate, a high-pressure locking cylinder cover, and a high-pressure locking cylinder piston. The high-pressure locking cylinder cover is installed on the end face of the tail plate, and the high-pressure locking cylinder cover and the tail plate are sealed. One end of the high-pressure locking cylinder piston slides in the tail plate, and the other end of the high-pressure locking cylinder piston slides in the high-pressure locking cylinder cover. Several support guide assemblies are axially installed on the step surface of the tail plate, and the high-pressure locking cylinder cover is provided with guide holes corresponding to the support guide assemblies. The other end of the support guide assembly always slides in the guide hole. A mold moving assembly that can axially retract is also installed in the high-pressure locking cylinder piston.

[0008] Optionally, the support guide assembly includes a guide rod, one end of which is mounted on the step surface of the tail plate, the other end of the guide rod is located in the guide hole, a guide ring is mounted on the guide rod, the guide ring slides in engagement with the guide hole, a third wear-resistant ring is mounted on the guide rods located on both axial sides of the guide ring, the third wear-resistant ring is located in the guide hole, and the guide rod located in the guide hole has a gap with the guide hole in the circumferential direction.

[0009] Optionally, a blind hole is provided on the step surface of the tail plate, a locking screw hole is provided at the bottom of the blind hole, a step through hole is provided axially on the guide rod, a locking screw is installed in the step through hole through threaded fitting, one end of the guide rod is fitted in the blind hole, and the locking screw is locked with the locking screw hole.

[0010] Optionally, the guide rod inserted into the blind hole is the positioning end of the guide rod, and a plurality of oil grooves are provided on the outer circle of the positioning end. When the high-pressure locking cylinder piston is pushed out, the oil groove is connected with the first oil chamber. An oil hole is also provided on the guide rod, and an oil inlet hole is provided on the oil groove. The oil inlet hole is connected with the oil hole. A countersunk hole is provided on the end face of the positioning end, and the countersunk hole is connected with the step through hole. One end of the oil hole is connected with the countersunk hole, and the other end of the oil hole is connected with the guide hole, and the guide hole, oil hole, countersunk hole and step through hole form a circulating oil circuit.

[0011] Optionally, the guide hole is a through hole, and a blocking cover assembly is installed on the other end of the guide hole away from the supporting guide assembly.

[0012] Optionally, the blocking cover assembly includes a blocking cover, which is provided with a through hole, the through hole is sealed by a plug, and the blocking cover is provided with an annular sealing groove, a sealing ring is installed in the sealing groove, and the sealing ring is squeezed on the inner wall of the guide hole.

[0013] Optionally, the mold shifting assembly includes a mold shifting shaft and a rotary holding bushing, a fixed cylinder is installed at the tail of the tail plate, the mold shifting shaft is installed in the fixed cylinder, a clamping rod is sleeved on the mold shifting shaft, and a first sealed oil chamber and a second sealed oil chamber are provided between the clamping rod and the mold shifting shaft, a circumferentially rotatable rotary holding bushing is installed in the piston of the high-pressure locking cylinder, and a turntable cylinder assembly for driving the rotary holding bushing to circumferentially rotate is installed on the outer end surface of the high-pressure locking cylinder piston, a plurality of first racks evenly distributed on the same circumference are axially arranged on the inner cavity wall of the rotary holding bushing, a guide groove is formed between two adjacent first racks, the clamping rod passes through the rotary holding bushing, and a plurality of second racks evenly distributed on the same circumference are arranged at the tail of the clamping rod, a tooth groove is formed between two adjacent second racks, the spacing between two adjacent teeth on the first rack is equal to the spacing between two adjacent teeth on the second rack, and the teeth on the first rack can rotate into the tooth groove between two adjacent teeth on the first rack.

[0014] Optionally, the holding rod is further provided with a guide tooth corresponding to the second rack, and the guide tooth is located in front of the corresponding second rack.

[0015] Optionally, the length of the first rack is smaller than the length of the second rack.

[0016] Optionally, the front end surface of the teeth of the first rack is a vertical surface, and the rear end surface of the teeth of the second rack is also a vertical surface.

[0017] The present invention has the following advantages:

[0018] 1. It does not increase the original axial and radial space of the equipment. Compared with the external support and guide structure, it saves more space and solves the space occupation problem;

[0019] 2. Effectively transmit and decompose the periodic uneven heavy impact load, reduce the bearing capacity of the first wear-resistant ring and the second wear-resistant ring, and then reduce the stress concentration of the first wear-resistant ring and the second wear-resistant ring, thereby extending the service life of the first wear-resistant ring and the second wear-resistant ring, so that the direct press will not leak oil for at least four years, thereby greatly extending the major maintenance interval time, which can be extended to once every four years or even six years, avoiding the direct economic losses caused by shutdown for major maintenance;

[0020] 3. The oil chambers at both ends of the guide rod are connected, which does not reduce the effective high-pressure clamping force. The guide rod is soaked in hydraulic oil, which fully utilizes the characteristics of the hydraulic oil for heat dissipation and lubrication, so there is no need to worry about the heating and lubrication problems of the guide rod;

[0021] 4. The position of high pressure each time the mold is closed has high repeatability, making the clamping force more balanced and stable, extending the service life of the mold and the high-pressure clamping cylinder, and reducing the noise of impact load;

[0022] 5. The biennial high-pressure clamping cylinder maintenance is changed to regular maintenance. Without dismantling the entire machine, only a few parts need to be removed, and the wear-resistant ring in the support and guide assembly can be replaced, solving the practical problems of maintenance and repair.

[0023] 6. When applying high pressure, the axial thrust can be shared by several tooth groups, thereby increasing the service life of the teeth and ensuring the reliability of the direct press in applying high pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the present invention;

[0025] Figure 2 Schematic diagram of the tailgate structure;

[0026] Figure 3 It is a structural diagram of the high-pressure clamping cylinder piston;

[0027] Figure 4 This is a schematic diagram of the installation of the support guide assembly;

[0028] Figure 5 for Figure 4 A magnified schematic diagram of point A in the middle;

[0029] Figure 6 This is a schematic diagram of the installation of the support guide assembly on the high-pressure clamping cylinder piston;

[0030] Figure 7 Schematic diagram of the structure supporting the guide assembly Figure 1 ;

[0031] Figure 8Schematic diagram of the structure supporting the guide assembly Figure 2 ;

[0032] Figure 9 Schematic diagram of the structure supporting the guide assembly Figure 3 ;

[0033] Figure 10 for Figure 9 Schematic cross-sectional view of the middle BB;

[0034] Figure 11 is a structural schematic diagram of the end cover assembly;

[0035] Figure 12 is a schematic cross-sectional view of an end cap assembly;

[0036] Figure 13 It is a schematic diagram of the structure when the support guide assembly is disassembled;

[0037] Figure 14 This is a structural diagram of the straight press when the clamping rod is reset;

[0038] Figure 15 This is a schematic diagram of the structure of the die-shifting assembly of the direct press when high pressure is applied;

[0039] Figure 16 Schematic diagram of the structure of the tooth rod;

[0040] Figure 17 Schematic diagram of the structure of the rotating assembly;

[0041] In the figure, 1-support guide assembly, 2-blocking cover assembly, 3-tail plate, 4-high-pressure clamping cylinder cover, 5-high-pressure clamping cylinder piston, 6-first wear-resistant ring, 7-second wear-resistant ring, 8-first oil chamber, 9-second oil chamber, 10-guide hole, 11-guide rod, 12-third wear-resistant ring, 13-guide ring, 14-oil groove, 15-locking screw, 16-oil inlet hole, 17-first oil outlet hole, 18-second oil outlet hole, 19-polygonal hole, 20-oil Hole, 21-blocking cover, 22-plug, 23-sealing ring, 24-supporting ring, 31-blind hole, 32-step through hole, 104-mold shifting shaft, 105-holding rod, 106-first sealed oil chamber, 107-second sealed oil chamber, 108-swing holding assembly, 109-fixing cylinder, 111-guide tooth, 112-second rack, 113-retracted tooth groove, 121-swing holding bushing, 122-guide groove, 123-first rack, 124-turn brake cylinder assembly. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0043] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0044] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0045] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0046] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is typically placed when in use, or are the orientations or positional relationships commonly understood by those skilled in the art. These terms are intended only to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0047] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0048] like Figure 1 and Figure 4As shown, a rear mold device of a straight press includes a tail plate 3, a high-pressure clamping cylinder cover 4 and a high-pressure clamping cylinder piston 5. The high-pressure clamping cylinder cover 4 is installed on the end surface of the tail plate 3 through a locking screw, and the high-pressure clamping cylinder cover 4 and the tail plate 3 are sealed. One end of the high-pressure clamping cylinder piston 5 is slidably fitted on the tail plate 3, and the other end of the high-pressure clamping cylinder piston 5 is slidably fitted on the high-pressure clamping cylinder cover 4. Figure 4 and Figure 5 As shown, there is a first oil chamber 8 between the high-pressure clamping cylinder piston 5 and the tail plate 3, and a second oil chamber 9 is provided between the tail plate 3, the high-pressure clamping cylinder cover 4 and the high-pressure clamping cylinder piston 5. When oil is injected into the first oil chamber 8, the high-pressure clamping cylinder piston 5 is pushed out, and when oil is injected into the second oil chamber, the high-pressure clamping cylinder piston 5 is retracted. Figure 4 and Figure 5 As shown, a number of support guide assemblies 1 are axially installed on the stepped surface of the tail plate 3, and a guide hole 10 corresponding to the support guide assembly 1 is opened on the cylinder head 4 of the high-pressure locking cylinder. The other end of the support guide assembly 1 always slides in the guide hole 10. Therefore, when the high-pressure locking cylinder piston 5 is assembled, the support guide assembly 1 has a guiding and positioning function, that is, the guide hole 10 and the support guide assembly 1 are aligned before the assembly of the high-pressure locking cylinder piston 5 and the tail plate 3 can be realized, thereby adding a positioning restriction to the assembly between the high-pressure locking cylinder piston 5 and the tail plate 3, thereby improving the assembly accuracy between the high-pressure locking cylinder piston 5 and the tail plate 3, and when the high-pressure locking cylinder piston 5 and the tail plate 3 are assembled After matching, the gravity of the high-pressure locking cylinder piston 5 is supported by the matching part of the tail plate 3 and the high-pressure locking cylinder piston 5 and the support guide assembly 1, so that the support guide assembly 1 shares the bearing capacity of the tail plate 3, thereby reducing the bearing capacity of the first wear-resistant ring 6 and the second wear-resistant ring 7, thereby reducing the stress concentration of the first wear-resistant ring 6 and the second wear-resistant ring 7, so that the bearing capacity distribution of the first wear-resistant ring 6 and the second wear-resistant ring 7 on the circumference is more uniform, thereby improving the service life of the first wear-resistant ring 6 and the second wear-resistant ring 7, and greatly extending the maintenance interval of the high-pressure locking device of the direct press, which can be extended to once every four years or even six years, avoiding direct economic losses caused by shutdown for major maintenance.

[0049] In this embodiment, as shown in FIG. Figure 8 、 Figure 9 and Figure 10 As shown, the support guide assembly 1 includes a guide rod 11, as shown in FIG. Figure 5 As shown, one end of the guide rod 11 is mounted on the step surface of the tail plate 3, and the other end of the guide rod 11 is located in the guide hole 10, as shown in FIG. Figure 7 、 Figure 8 and Figure 10As shown, a guide ring 13 is installed on the guide rod 11, and the guide ring 13 slides with the guide hole 10. A third wear-resistant ring 12 is installed on the guide rod 11 on both sides of the guide ring 13. The third wear-resistant ring 12 is located in the guide hole 10. The guide ring 13 adopts Orkot Tekaisi ring, and the third wear-resistant ring 12 adopts Orkot wear-resistant ring. In this embodiment, Figure 5 As shown, the diameters of the third wear-resistant ring 12 and the guide ring 13 are both larger than the diameter of the guide rod 11. Therefore, the guide rod 11 located in the guide hole 10 has a gap with the guide hole 10 in the circumferential direction, so that the support guide assembly 1 and the high-pressure clamping cylinder piston 5 are in flexible contact, thereby utilizing the excellent performance of the flexible wear-resistant ring in hydraulics and using it in the support guide assembly 1. In conjunction with the rigid guide rod 11, the periodic uneven heavy impact load borne by the high-pressure clamping cylinder piston 5 during operation is shared, thereby extending the service life of the clamping device and the maintenance interval. In addition, when in use, there are two guide rings 13 and they are arranged axially at intervals. The guide ring 13 mainly plays a bearing role, and the third wear-resistant ring 12 can effectively absorb the contamination particles in the hydraulic oil to ensure the reliable and stable operation of the servo valve. In this embodiment, as shown in FIG. Figure 6 As shown, several support and guide assemblies 1 are distributed on the same circumference. Preferably, the support and guide assemblies 1 adopt a matrix distributed design to evenly distribute the points of application of the clamping force and further offset the radial force, so that the axial clamping force is more balanced and more stable. Of course, in other embodiments, several support and guide assemblies 1 can also be evenly distributed on the same circumference, so as to reasonably share the load originally borne by the high-pressure clamping cylinder piston 5, greatly extending the service life of the cylinder. Therefore, the support and guide assembly 1 of this embodiment also has a guiding function, so that the position of high pressure each time the mold is closed has a higher repeatability accuracy, thereby also extending the service life of the mold.

[0050] In this embodiment, if Figure 2 As shown, a blind hole 31 is provided on the step surface of the tail plate 3, and a locking screw hole is provided at the bottom of the blind hole 31. Figure 10 As shown, a stepped through hole 32 is axially opened on the guide rod 11, and a locking screw 15 is installed on the stepped through hole 32 through threaded cooperation. Therefore, an internal thread that cooperates with the locking screw 15 is opened on the stepped through hole 32, and one end of the guide rod 11 is fitted in the blind hole 31, and the locking screw 15 is locked with the locking screw hole, so that the support guide assembly 1 can be disassembled, thereby facilitating the replacement of the guide ring 13 and the third wear-resistant ring 12.

[0051] In this embodiment, the guide rod 11 inserted into the blind hole 31 is the positioning end of the guide rod 11. Figure 7 and Figure 8As shown, a plurality of oil grooves 14 are provided on the outer circle of the positioning end. When the high-pressure clamping cylinder piston 5 is ejected, the oil grooves 14 are connected to the first oil chamber 8. An oil hole 20 is also provided on the guide rod 11. An oil inlet hole 16 is provided on the oil groove 14. The oil inlet hole 16 is connected to the oil hole 20. The end of the oil hole 20 close to the blind hole 31 is the second oil outlet hole 18, and the end away from the blind hole 31 is the first oil outlet hole 17. Preferably, the oil grooves 14 are axially opened, and there are four oil grooves 14. The four oil grooves 14 are evenly distributed on the same circumference. There are also four oil holes 20 corresponding to the oil grooves 14. The oil holes 20 are also axially opened. A countersunk hole is provided on the end face of the positioning end, as shown in FIG. Figure 4 and Figure 5 As shown, the countersunk hole is connected to the step through hole 32, one end of the oil hole 20 is connected to the countersunk hole, that is, the second oil outlet hole 18 is connected to the countersunk hole, and the other end of the oil hole 20 is connected to the guide hole 10, that is, the first oil outlet hole 17 is connected to the guide hole 10, so that the guide hole 10, the oil hole 20, the countersunk hole and the step through hole 32 form a circulating oil circuit, so that the support guide assembly 1 is always immersed in hydraulic oil, and the hydraulic oil can play a lubricating role, thereby ensuring the service life of the support guide assembly 1, and because the two ends of the guide rod 11 are connected by the oil hole 20, the oil chambers at both ends of the guide rod 11 are always in a connected state, thereby not reducing the effective high-pressure clamping force, and ensuring the reliability of the high-pressure clamping device of the direct press.

[0052] In this embodiment, if Figure 10 As shown, the guide hole 10 is a through hole. Figure 4 and Figure 5 As shown, a plug cover 21 assembly 2 is installed on the other end of the guide hole 10 away from the support guide assembly 1, and the plug cover 21 assembly 2 is detachably installed on the high-pressure clamping cylinder piston 5. Further, as shown Figure 11 and Figure 12 As shown, the plug cover 21 assembly 2 includes a plug cover 21, which is installed on the high-pressure clamping cylinder piston 5 through a locking screw, and the end surface of the plug cover 21 does not protrude from the end surface of the high-pressure clamping cylinder piston 5. A through hole is provided on the plug cover 21, and the through hole is blocked by a plug 22. An annular sealing groove is provided on the plug cover 21, and a sealing ring 23 is installed in the sealing groove. The sealing ring 23 is squeezed on the inner wall of the guide hole 10. Further, as shown Figure 10 and Figure 11As shown, the sealing groove is also provided with a supporting ring 24, which is located on the outside of the corresponding sealing groove. The plugging cover 21 assembly 2 is a normally sealed component. When the support guide assembly 1 is not replaced, the plugging cover 21 assembly 2 always blocks the guide hole 10, thereby preventing the hydraulic oil in the guide hole 10 from leaking. By setting the plugging cover 21 assembly 2, the support guide assembly 1 can be disassembled without disassembling the tail plate 3, the live plate and the high-pressure clamping cylinder cover 4. That is, when disassembling, the plug 22 is removed, and then a screw is inserted from the through hole and stuck with the head of the locking screw 15. In order to facilitate the reliability of the connection between the screw and the locking screw 15, as shown in FIG. Figure 9 As shown, a polygonal hole 19 is provided at the head of the locking screw 15. Preferably, the polygonal hole 19 is a hexagonal hole, and the front end of the screw is a hexagonal prism corresponding to the hexagonal hole. By rotating the screw, the locking screw 15 is driven to rotate, thereby loosening the locking screw 15, so that the locking screw 15 is taken out first. Figure 13 As shown, a special screw is then inserted into the through hole and matched with the internal thread of the stepped through hole 32 on the guide rod 11, and then axial tension is applied to remove the guide rod 11 and the plug cover 21, and then the plug cover 21 assembly 2 and the supporting guide device can be disassembled. During installation, the guide rod 11 is first installed into the guide hole 10. Of course, the third wear-resistant ring 12 and the guide ring 13 on the guide rod 11 have been assembled, and the locking screw 15 can be first installed into the guide hole 10 together with the guide rod 11, and then the screw is inserted into the hexagonal hole of the locking screw hole. Since the guide ring 13 is in a matching relationship with the guide hole 10, when the guide rod 11 and the locking screw 15 are installed, the guide rod 11 and the locking screw 15 are in the axial direction, so the locking screw 15 is aligned with the locking screw hole, so as the screw drives the locking screw 15 to rotate The locking screw 15 is moved, thereby locking the locking screw 15 with the locking screw hole. In order to increase the locking force of the locking screw 15 and the locking screw hole, a spring washer is sleeved on the head of the locking screw 15, and since the spring washer itself has a notch, the hydraulic oil can enter the step through hole 32 from the notch. When the locking screw 15 is locked with the locking screw hole, the end face of the positioning end abuts against the step surface, thereby completing the installation of the support guide assembly 1, and then the plug cover 21 assembly 2 can be installed. Therefore, during the small-scale maintenance of the direct press, there is no need to disassemble the high-pressure locking cylinder piston 5 and the high-pressure locking cylinder cylinder head 4, thereby shortening the maintenance time. Moreover, since the high-pressure locking cylinder piston 5 and the high-pressure locking cylinder cylinder head 4 are not disassembled, the direct press does not need to be tested after maintenance and can be used directly, which saves time and has less economic impact on the enterprise.

[0053] In this embodiment, if Figure 1 The high pressure clamping cylinder piston 5 is also equipped with a mold moving assembly capable of axial expansion and contraction, such as Figure 14 、 Figure 15 As shown, the mold shifting assembly includes a mold shifting shaft 104 and a rotary holding bushing 121, a fixed cylinder 109 is installed at the tail of the tail plate 3, and the mold shifting shaft 104 is installed in the fixed cylinder 109, and a clamping rod 105 is sleeved on the mold shifting shaft 104, and a first sealed oil chamber 106 and a second sealed oil chamber 107 are provided between the clamping rod 105 and the mold shifting shaft 104, and a circumferentially rotatable rotary holding assembly 108 is installed in the high-pressure clamping cylinder piston 5, and the rotary holding assembly 108 includes a rotary holding bushing 121 and a turntable cylinder assembly 124, and the turntable cylinder assembly 124 drives the rotary holding bushing 121 to rotate circumferentially in the high-pressure clamping cylinder piston 5. In this embodiment, the turntable cylinder assembly 124 is a common structure on the direct press, that is, the turntable cylinder assembly 124 drives the rotary holding bushing 121 to rotate circumferentially in the high-pressure clamping cylinder piston 5, which belongs to the prior art and is therefore not described in detail.

[0054] In this embodiment, if Figure 17 As shown, a plurality of first racks 123 evenly distributed on the same circumference are axially arranged on the inner wall of the rotary sleeve 121, and a guide groove 122 is formed between two adjacent first racks 123. The tooth rod 105 passes through the rotary sleeve 121. Figure 14 、 Figure 15 and Figure 16 As shown, the tail of the holding rod 105 is provided with a plurality of second racks 112 evenly distributed on the same circumference, and a tooth groove 113 is formed between two adjacent second racks 112. The spacing between two adjacent teeth on the first rack 123 is equal to the spacing between two adjacent teeth on the second rack 112, and the teeth on the first rack 123 can rotate into the tooth groove between two adjacent teeth on the first rack 123, as shown in FIG. Figure 15As shown, when the holding rod 105 needs to be extended, oil is injected into the second sealed oil chamber 107. At this time, the holding rod 105 is extended. On the axial projection surface, the axial projection of the second rack 112 is located within the axial projection of the guide groove 122. Then, during the extension of the holding rod 105, the second rack 112 enters the guide groove 122. When the guide rod 11 is extended into place, the brake cylinder assembly 124 works, thereby rotating the holding bushing 121, so that the teeth of the second rack 112 enter the tooth groove of the first rack 123. Then the direct press starts high pressure, and the high-pressure clamping cylinder piston 5 extends, with The dynamic rotary holding assembly 108 moves axially together. When the teeth of the first rack 123 abut against the teeth of the second rack 112, the high-pressure clamping cylinder piston 5, the rotary holding assembly 108 and the holding rod 105 move synchronously. After the high pressure of the straight press is completed, when it needs to be reset, the turntable cylinder assembly 124 works to make the rotary holding bushing 121 rotate in the opposite direction, thereby making the teeth of the second rack 112 exit the tooth groove of the first rack 123, and the second rack 112 enters the guide groove 122, while the first rack 123 is located in the tooth withdrawal groove 113. Then, hydraulic oil is injected into the first sealed oil chamber 106. Figure 14 As shown, at this time, the clamping rod 105 contracts and resets, and then the high-pressure clamping cylinder piston 5 resets, and the high pressure of the direct press ends.

[0055] In this embodiment, if Figure 16 As shown, the holding rod 105 is further provided with a guide tooth 111 corresponding to the second rack 112, and the guide tooth 111 is located in front of the corresponding second rack 112. When the holding rod 105 is in the reset state, the guide tooth 111 is located on the rear side of the rotary holding bushing 121. Further, the guide tooth 111 matches the guide groove 122. When the guide tooth 111 is in the guide groove 122, the guide tooth 111 and the guide groove 122 are in a sliding fit relationship, and then the circumferential position of the holding rod 105 can be limited by the guide tooth 111. That is to say, when the holding rod 105 is in the reset state, the guide tooth 111 is located at the rear side of the rotary holding bushing 121. 05 deviates from the circumferential position, the guide tooth 111 cannot enter the guide tooth 111, and the guide tooth 111 will not cause damage to the first rack 123. Furthermore, the front end face of the guide tooth 111 is a bevel, and the rear end inner cavity of the rotary bushing 121 is also provided with a bevel. Therefore, when the circumferential position of the clamping rod 105 deviates, the bevel of the guide tooth 111 abuts against the bevel of the clamping rod 105, thereby preventing the clamping rod 105 from moving axially forward, and through the abutment of the bevel, the impact damage of the clamping rod 105 on the rotary bushing 121 is reduced.

[0056] In this embodiment, if Figure 14 and Figure 15As shown, the length of the first rack 123 is smaller than the length of the second rack 112. Therefore, when the direct press is operating at high pressure, the teeth on the first rack 123 can all abut against the teeth on the second rack 112, thereby enabling the axial thrust of the direct press when operating at high pressure to be shared by the tooth groups of the first rack 123 and the second rack 112, thereby reducing the impact load of a single tooth on the first rack 123 and a single tooth on the second rack 112, thereby increasing the service life of the first rack 123 and the second rack 112 and ensuring the reliability of the direct press when operating at high pressure.

[0057] In this embodiment, if Figure 14 and Figure 15 As shown, the front end face of the teeth of the first rack 123 is a vertical face, and the rear end face of the teeth of the second rack 112 is also a vertical face. Therefore, after the first rack 123 and the second rack 112 abut, there is no radial force component, thereby ensuring the reliability of the high pressure of the direct press.

[0058] In this embodiment, if Figure 14 and Figure 15 As shown, the first rack 123 and the second rack 112 are six in number, and the first rack 123 has eight teeth and six tooth grooves. Therefore, when the direct press is applied with high pressure, its axial thrust is shared by forty-two groups of teeth, further ensuring the reliability of the direct press in applying high pressure.

[0059] The working process of the present invention is as follows: when the straight press is high pressure, oil is injected into the second sealed oil chamber 107. At this time, the clamping rod 105 extends, and the second rack 112 enters the guide groove 122. When the guide rod 11 is extended into place, the turntable cylinder assembly 124 works, thereby rotating the clamping bushing 121, so that the teeth of the second rack 112 enter the tooth groove of the first rack 123. Then the straight press is high pressure, and the high pressure clamping cylinder piston 5 extends, driving the clamping assembly 108 to move axially together. When the teeth of the first rack 123 abut against the teeth of the second rack 112, the high pressure The clamping cylinder piston 5, the rotary holding assembly 108 and the clamping rod 105 move synchronously. After the high pressure of the direct press is completed, when it needs to be reset, the brake cylinder assembly 124 works to make the rotary holding bushing 121 rotate in the opposite direction, thereby making the teeth of the second rack 112 withdraw from the tooth groove of the first rack 123, and the second rack 112 enters the guide groove 122, while the first rack 123 is located in the tooth withdrawal groove 113, and then hydraulic oil is injected into the first sealed oil chamber 106. As shown in the figure, the clamping rod 105 contracts and resets at this time, and then the high pressure clamping cylinder piston 5 resets, and the high pressure of the direct press is completed.

[0060] With the long-term use of the straight press, when minor maintenance is required, the plug 22 is first disassembled, and then a screw is inserted from the through hole and stuck with the head of the locking screw 15. By rotating the screw, the locking screw 15 is driven to rotate, thereby loosening the locking screw 15, and the locking screw 15 is first taken out, as shown in the figure, and then a special screw is inserted from the through hole and matched with the internal thread of the step through hole 32 on the guide rod 11, and then axial tension is applied to remove the guide rod 11 and the plug cover 21, and then the plug cover 21 assembly 2 and the supporting guide device can be disassembled, thereby completing the third sealing ring, guide After the ring 13 is replaced, the guide rod 11 is first installed into the guide hole 10. Of course, after the third wear-resistant ring 12 and the guide ring 13 on the guide rod 11 have been assembled, the locking screw 15 can be first installed into the guide hole 10 together with the guide rod 11, and then the screw is inserted into the hexagonal hole of the locking screw hole. As the screw drives the locking screw 15 to rotate, the locking screw 15 is locked with the locking screw hole. When the locking screw 15 is locked with the locking screw hole, the end face of the positioning end abuts against the step surface, thereby completing the installation of the support guide assembly 1, and then the blocking cover 21 assembly 2 can be installed.

[0061] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rear mold device for a straight press, comprising a tail plate, a high-pressure mold locking cylinder cover, and a high-pressure mold locking cylinder piston. The high-pressure mold locking cylinder cover is mounted on the end surface of the tail plate, and a seal is formed between the high-pressure mold locking cylinder cover and the tail plate. One end of the high-pressure mold locking cylinder piston slides in the tail plate, and the other end of the high-pressure mold locking cylinder piston slides in the high-pressure mold locking cylinder cover. The device is characterized in that: A plurality of support guide assemblies are axially installed on the step surface of the tail plate, and a guide hole corresponding to the support guide assembly is provided on the cylinder head of the high-pressure locking cylinder, and the other end of the support guide assembly is always slidably fitted in the guide hole. A mold moving assembly that can axially retract is also installed in the piston of the high-pressure locking cylinder, and the support guide assembly includes a guide rod, one end of the guide rod is installed on the step surface of the tail plate, and the other end of the guide rod is located in the guide hole. A guide ring is installed on the guide rod, and the guide ring slides with the guide hole. A third wear-resistant ring is installed on the guide rods located on both axial sides of the guide ring, and the third wear-resistant ring is both located in the guide hole. The guide rod located in the guide hole has a gap with the guide hole in the circumferential direction, and a blind hole is provided on the step surface of the tail plate. The hole of the blind hole The bottom is provided with a locking screw hole, and the guide rod is axially provided with a stepped through hole, and a locking screw is installed on the stepped through hole through threaded cooperation, one end of the guide rod is engaged in the blind hole, and the locking screw is locked with the locking screw hole, and the guide rod inserted in the blind hole is the positioning end of the guide rod, and a plurality of oil grooves are provided on the outer circle of the positioning end. When the piston of the high-pressure locking cylinder is ejected, the oil groove is connected with the first oil chamber, and an oil through hole is also provided on the guide rod, and an oil inlet hole is provided on the oil through groove, and the oil inlet hole is connected with the oil through hole, and a countersunk hole is provided on the end surface of the positioning end, and the countersunk hole is connected with the stepped through hole, one end of the oil through hole is connected with the countersunk hole, and the other end of the oil through hole is connected with the guide hole, and the guide hole, the oil through hole, the countersunk hole and the stepped through hole form a circulating oil circuit.

2. The rear mold device of a straight press according to claim 1, characterized in that: The guide hole is a through hole, and a blocking cover assembly is installed on the other end of the guide hole away from the supporting guide assembly.

3. The rear mold device of a straight press according to claim 2, characterized in that: The plugging cover assembly includes a plugging cover, a through hole is formed on the plugging cover, the through hole is blocked by a plug, an annular sealing groove is formed on the plugging cover, a sealing ring is installed in the sealing groove, and the sealing ring is squeezed on the inner wall of the guide hole.

4. A rear mold device for a straight press according to any one of claims 1 to 3, characterized in that: The mold shifting assembly includes a mold shifting shaft and a rotary holding bushing. A fixed cylinder is installed at the tail end of the tail plate, and the mold shifting shaft is installed in the fixed cylinder. A clamping rod is sleeved on the mold shifting shaft, and a first sealed oil chamber and a second sealed oil chamber are defined between the clamping rod and the mold shifting shaft. The rotary holding bushing that can rotate circumferentially is installed in the piston of the high-pressure mold locking cylinder, and a turntable cylinder assembly that drives the rotary holding bushing to rotate circumferentially is installed on the outer end surface of the high-pressure mold locking cylinder piston. A plurality of first racks uniformly distributed on the same circumference are axially arranged on the inner cavity wall of the rotary holding bushing, and a guide groove is formed between two adjacent first racks. The clamping rod passes through the rotary holding bushing, and a plurality of second racks uniformly distributed on the same circumference are provided at the tail end of the clamping rod, and a tooth recess is formed between two adjacent second racks. The spacing between two adjacent teeth on the first rack is equal to the spacing between two adjacent teeth on the second rack, and the teeth on the first rack can rotate into the tooth groove between two adjacent teeth on the first rack.

5. The rear mold device of a straight press according to claim 4, characterized in that: The holding rod is further provided with a guide tooth corresponding to the second rack, and the guide tooth is located in front of the corresponding second rack.

6. The rear mold device of a straight press according to claim 5, characterized in that: The length of the first rack is smaller than the length of the second rack.

7. The rear mold device of a straight press according to claim 6, characterized in that: The front end surface of the teeth of the first rack is a vertical surface, and the rear end surface of the teeth of the second rack is also a vertical surface.

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