Hydraulic cylinder

Abstract

The utility model discloses a hydraulic cylinder, and aims to solve the technical problems that in the prior art, in the process that a pushing mechanism pushes raw materials, the speed is low, and a piston rod cannot rapidly eject the raw materials. The device comprises a cylinder sleeve, an upper cover and a lower cover, the cylinder sleeve, the upper cover and the lower cover can form a cavity, an ejection piston rod capable of moving up and down is arranged in the cavity, a through hole is formed in the ejection piston rod, one side, facing the upper cover, of the lower cover is connected with an ejection retreating piston rod, the ejection retreating piston rod can penetrate through the through hole, and the ejection retreating piston rod is connected with the ejection retreating piston rod. The upper cover is provided with a first hydraulic hole connected with the cavity, and the lower cover is provided with a second hydraulic hole connected with the cavity. Through cooperation of the ejection piston rod and the ejection retreating piston rod, high-low-pressure ejection or low-speed high-pressure ejection of the ejection piston rod is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of mold processing tools, in particular to a hydraulic cylinder. Background Art

[0002] During the mold manufacturing process, the raw materials need to be poured into the material pipe and heated. When the raw materials are heated to a melted state, the pushing mechanism pushes the raw materials to a distant check valve port. The melted raw materials are pushed out from the check valve port and injected into the mold cavity formed by the front mold and the rear mold from the gate.

[0003] There are the following problems:

[0004] 1. In the process of pushing the raw materials by the pushing mechanism, the speed is slow and the piston rod cannot be ejected quickly;

[0005] 2. When a single hydraulic cylinder pushes the raw materials, it bears a greater pressure. Utility Model Content

[0006] (1) Technical issues to be solved

[0007] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a hydraulic cylinder, aiming to solve the technical problems existing in the background technology of the prior art.

[0008] (2) Technical solution

[0009] A hydraulic cylinder comprises: a cylinder sleeve, an upper cover, and a lower cover, wherein the cylinder sleeve, the upper cover, and the lower cover can form a cavity, in which there is an ejection piston rod that can move up and down, a through hole is provided inside the ejection piston rod, a side of the lower cover facing the upper cover is connected to a retraction piston rod, the retraction piston rod can pass through the through hole, the upper cover is provided with a hydraulic hole 1 connected to the cavity, and the lower cover is provided with a hydraulic hole 2 connected to the cavity.

[0010] Furthermore, a ring-shaped sealing groove 1 is provided inside the through hole, and a U-shaped sealing ring can be accommodated in the sealing groove 1, and the U-shaped sealing ring can be tightly attached to the retracting piston rod and the ejecting piston rod.

[0011] Furthermore, a groove is provided on the side of the lower cover facing the upper cover, and the ejection piston rod can be inserted into the groove. An opening is provided on the side of the groove away from the ejection piston rod, and a threaded hole is provided on the side of the ejection piston rod facing the groove. A screw can be inserted into the opening to fasten the ejection piston rod in the groove.

[0012] Furthermore, a second threaded hole is provided on the side of the lower cover facing the upper cover, and a thread matching the second threaded hole is provided on the end of the ejection piston rod facing the lower cover, and the ejection piston rod can be fixed to the lower cover through the second threaded hole.

[0013] Furthermore, a hydraulic hole three is provided on the cylinder sleeve.

[0014] Furthermore, the cylinder liner includes an inner wall and a contact surface, and a boss 1 matching the cross-section of the cavity is provided on the side of the upper cover facing the lower cover, and a groove 2 is provided on the side of the boss 1 that fits the cavity, and an O-ring can be placed in the groove 2; a groove 3 is provided on the side of the upper cover that contacts the contact surface, and an O-ring can be placed in the groove 3.

[0015] Furthermore, the cylinder liner includes an inner wall and a contact surface, and a boss 2 matching the cross-section of the cavity is provided on the side of the lower cover facing the upper cover, and a groove 4 is provided on the side of the boss 2 that fits the cavity, and an O-ring can be placed in the groove 4; a groove 5 is provided on the side of the lower cover that contacts the contact surface, and an O-ring can be placed in the groove 5.

[0016] A parallel combined hydraulic cylinder includes all the above solutions and also includes a plate-shaped connecting portion, wherein the connecting portion and the parallel connected cylinder sleeve are cast in an integrated manner.

[0017] Furthermore, the connecting portion is provided with reinforcing ribs on both sides that are not in contact with the cylinder sleeve, and the reinforcing ribs are perpendicular to the movement direction of the ejection piston rod.

[0018] Furthermore, a fixing seat is provided in the middle of the connecting portion, and the fixing seat includes a mounting end surface, and the flatness of the mounting end surface is less than 0.05 mm.

[0019] (3) Beneficial effects

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] 1. Through the cooperation between the ejection piston rod and the ejection piston rod, high-speed and low-pressure ejection or low-speed and high-pressure ejection can be achieved;

[0022] 2. The pressure of a single hydraulic cylinder can be reduced by using parallel hydraulic cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 : Schematic diagram of the positions of the ejection piston rod and the ejection piston rod of the utility model.

[0024] Figure 2 : A structural diagram of a method for fixing a ejection piston rod of the utility model.

[0025] Figure 3 : Structural diagram of the second fixing method of the ejection piston rod of the utility model.

[0026] Figure 4 : Schematic diagram of three positions of hydraulic hole of the utility model.

[0027] Figure 5 : Schematic diagram of the sealing method of the upper cover, cylinder body and lower cover of the utility model.

[0028] Figure 6 : The utility model of the parallel combination hydraulic cylinder structure diagram.

[0029] The markings of the components in the accompanying drawings are as follows:

[0030] 1-cylinder sleeve, 11-hydraulic hole three, 12-inner wall, 13-contact surface, 2-upper cover, 21-hydraulic hole one, 22-boss one, 221-groove two, 23-O-ring, 24-groove three, 3-lower cover, 31-hydraulic hole two, 32-groove, 321-opening, 322-screw, 33-threaded hole two, 34-boss two, 341-groove four, 35-groove five, 4-cavity, 5-injection piston rod, 51-through hole, 511-sealing groove one, 512-U-shaped sealing ring, 6-retraction piston rod, 61-threaded hole one, 62-thread, 7-connecting part, 71-reinforcement rib, 72-fixed seat, 721-installation end face. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0033] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0035] Please refer to Figure 1-6 ,

[0036] like Figure 1 As shown, the utility model provides a hydraulic cylinder, including: a cylinder sleeve 1, an upper cover 2, and a lower cover 3. The cylinder sleeve 1, the upper cover 2, and the lower cover 3 can form a cavity 4. In the cavity 4, there is an ejection piston rod 5 that can move up and down. A through hole 51 is provided inside the ejection piston rod 5. The side of the lower cover 3 facing the upper cover 2 is connected to an ejection piston rod 6. The ejection piston rod 6 can pass through the through hole 51. The upper cover 2 is provided with a hydraulic hole 1 21 connected to the cavity 4. The lower cover 3 is provided with a hydraulic hole 2 31 connected to the cavity 4. The lower cover 3 is connected to the ejection piston rod 6 on the side facing the upper cover 2. At the same time, a through hole 51 is provided inside the ejection piston rod 5. The through hole 51 can allow the ejection piston rod 6 to pass through. In the process of the ejection piston rod 5 moving back and forth, it is necessary to ensure that the hydraulic pressure in the space formed by the through hole 51 and the ejection piston rod 6 will basically not leak into the space formed by the ejection piston rod 6 and the cylinder sleeve 1 and the lower cover 3. The reason why the ejection piston rod 5 can eject quickly is that the cross-sectional area of ​​the through hole 51 is smaller than the area of ​​the ejection piston rod 5 minus the ejection piston rod 6. When the hydraulic oil is constantly injected into the hydraulic cylinder, the cylinder body with a smaller cross-sectional area can obtain a faster transfer speed. Thanks to this principle, when hydraulic oil is injected into the through hole 51, the hydraulic oil will squeeze the through hole 51 sealed by the ejection piston rod 6. As the amount of hydraulic oil increases, a larger accommodating space is needed. The ejection piston rod 5 will move upward to free up a larger space formed by the through hole 51 and the ejection piston rod 6. In this way, the ejection piston rod 5 realizes a high-speed and low-pressure rapid ejection action. When rapid ejection is not required, hydraulic oil is injected into the space formed by the ejection piston rod 5 and the lower cover 3, the ejection piston rod 6, and the cylinder sleeve 1. The more hydraulic oil there is, the more it pushes the ejection piston rod to move upward. In this way, the ejection piston rod 5 realizes a low-speed and high-pressure ejection movement.

[0037] like Figure 1 As shown, a circle of annular sealing groove 1 511 is provided inside the through hole 51, and a U-shaped sealing ring 512 can be accommodated in the sealing groove 1 511, and the U-shaped sealing ring 512 can be closely attached to the retracting piston rod 6 and the ejecting piston rod 5. It is necessary to ensure that the hydraulic pressure in the space formed by the through hole 51 and the retracting piston rod 6 will not basically leak into the space formed by the retracting piston rod 6 and the cylinder sleeve 1 and the lower cover 3. The specific method is to open a circle of annular sealing groove 1 511 inside the through hole 51, place the U-shaped sealing ring 512 in the sealing groove 1 511, and make the U-shaped sealing ring 512 closely attached to the through hole 51 of the retracting piston rod 6 and the ejecting piston rod 5.

[0038] like Figure 2As shown, the side of the lower cover 3 facing the upper cover 2 is provided with a groove 32, and the shooting piston rod 6 can be inserted into the groove 32. The side of the groove 32 away from the shooting piston rod 6 is provided with an opening 321. The side of the shooting piston rod 6 facing the groove 32 is provided with a threaded hole 61. The shooting piston rod 6 can be fastened in the groove 32 by inserting a screw 322 through the opening 321. The shooting piston rod 6 needs to be connected with the lower cover 3. As a preferred solution, the groove 32 can be provided on the side of the lower cover 3 facing the upper cover 2, and an opening 321 is provided at the bottom of the groove 32 so that the shooting piston rod 6 can be inserted into the groove 32, but the shooting piston rod 6 will not fall out of the opening 321. The side of the shooting piston rod 6 facing the groove 32 is also provided with a threaded hole 61. When the screw 322 is inserted from the opening 321, it can be locked with the threaded hole 61 of the shooting piston rod 6. A sealing ring needs to be inserted between the shooting piston rod 6 and the groove 32 to prevent leakage.

[0039] like Figure 3 As shown, the side of the lower cover 3 facing the upper cover 2 is provided with a second threaded hole 33, and the end of the ejection piston rod 6 facing the lower cover 3 is provided with a thread 62 matching the second threaded hole 33, and the ejection piston rod 6 can be fixed to the lower cover 3 through the second threaded hole 33. The ejection piston rod 6 needs to be connected to the lower cover 3. As another preferred solution, a second threaded hole 33 can be opened on the side of the lower cover 3 facing the upper cover 2, and a thread 62 matching the second threaded hole 33 can be machined on the side of the ejection piston rod 6 facing the lower cover 3. After applying thread glue in the second threaded hole 33, the ejection piston rod 6 can be fixed to the lower cover 3.

[0040] like Figure 4 As shown, the cylinder sleeve 1 is provided with a hydraulic hole 3 11. A hydraulic hole 3 11 is provided on the side of the cylinder sleeve 1 close to the lower cover 3, and the hydraulic hole 3 11 can be connected with the cavity 4, serving as a second hydraulic oil inlet and outlet of low speed and high pressure, which helps the hydraulic oil to quickly enter or be discharged into the hydraulic cylinder.

[0041] like Figure 5As shown, the cylinder sleeve 1 includes an inner wall 12 and a contact surface 13, and the side of the upper cover 2 facing the lower cover 3 is provided with a boss 22 matching the cross-section of the cavity 4, and the side of the boss 22 that fits with the cavity 4 is provided with a groove 221, and an O-ring 23 can be placed in the groove 221; the side of the upper cover 2 that contacts the contact surface 13 is provided with a groove 3 24, and an O-ring 23 can be placed in the groove 3 24. In order to prevent liquid leakage between the cylinder liner 1 and the upper cover 2, a boss 22 matching the cross-section of the cavity 4 is provided on the side of the upper cover 2 facing the lower cover 3, and the boss 22 can directly contact the inner wall 12, and the upper cover 2 itself can contact the contact surface 13 of the cylinder liner 1, so that there are two contact surfaces between the upper cover 2 and the cylinder liner 1, a groove 221 is provided on the side where the boss 22 fits the cavity 4, and a groove 3 24 is provided on the side where the upper cover 2 contacts the contact surface 13, and O-rings 23 are placed in the grooves 221 and 24, so that the sealing effect of the upper cover 2 and the cylinder liner 1 is achieved by a double anti-leakage device.

[0042] like Figure 5 As shown, the cylinder sleeve 1 includes an inner wall 12 and a contact surface 13, and the side of the lower cover 3 facing the upper cover 2 is provided with a second boss 34 matching the cross-section of the cavity 4, and the side of the second boss 34 that fits with the cavity 4 is provided with a fourth groove 341, and the O-ring 23 can be placed in the fourth groove 341; the side of the lower cover 3 that contacts the contact surface 13 is provided with a fifth groove 35, and the O-ring 23 can be placed in the fifth groove 35. In order to prevent liquid leakage between the cylinder liner 1 and the lower cover 3, a boss 2 34 matching the cross-section of the cavity 4 is provided on the side of the lower cover 3 facing the upper cover 2, and the boss 2 34 can directly contact the inner wall 12, and the lower cover 3 itself can contact the contact surface 13 of the cylinder liner 1, so that there are two contact surfaces between the lower cover 3 and the cylinder liner 1, a groove 4 341 is provided on the side where the boss 2 34 fits with the cavity 4, and a groove 5 35 is provided on the side where the lower cover 3 contacts the contact surface 13, and O-rings 23 are placed in the groove 4 341 and the groove 5 35, so that the sealing effect of the lower cover 3 and the cylinder liner 1 is achieved by a double anti-leakage device.

[0043] like Figure 6 As shown, a parallel combined hydraulic cylinder includes a plate-shaped connecting portion 7, and the connecting portion 7 and the parallel connected cylinder sleeve 1 adopt an integrated casting process. The cylinder sleeve 1 with multiple cylinder positions using an integrated casting process can save the assembly personnel's time for later assembly and molding. At the same time, when the parallel combined hydraulic cylinder is subjected to force, the integrated connecting portion 7 can be pulled and subjected to force, which is less likely to deform than the method of locking with screws.

[0044] like Figure 6As shown, the connecting portion 7 is provided with reinforcing ribs 71 on both sides not in contact with the cylinder sleeve 1, and the reinforcing ribs 71 are perpendicular to the movement direction of the ejection piston rod 5. In order to increase the stability of the parallel combined hydraulic cylinder, reinforcing ribs 71 are respectively provided on both sides of the plate-shaped connecting portion 7 not in direct contact with the cylinder sleeve 1, and the reinforcing ribs 71 are also integrally cast with the cylinder sleeve 1.

[0045] like Figure 6 As shown, a fixing seat 72 is provided in the middle of the connecting portion 7, and the fixing seat 72 includes a mounting end face 721, and the flatness of the mounting end face 721 is less than 0.05 mm. The parallel combined hydraulic cylinder needs a fixing seat 72 that is interconnected with the mold assembly equipment. Usually, the parallel combined hydraulic cylinder requires a higher installation precision, and the precision of the parts themselves is also required to eliminate the cause of the assembly engineer's assembly technique, so the flatness of the mounting end face 721 of the fixing seat 72 needs to be less than 0.05 mm.

[0046] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A hydraulic cylinder, characterized in that: include: A cylinder sleeve (1), an upper cover (2), and a lower cover (3), wherein the cylinder sleeve (1), the upper cover (2), and the lower cover (3) can form a cavity (4), wherein an ejection piston rod (5) is arranged in the cavity (4) and can move up and down, wherein a through hole (51) is arranged inside the ejection piston rod (5), wherein a side of the lower cover (3) facing the upper cover (2) is connected to a ejection piston rod (6), wherein the ejection piston rod (6) can pass through the through hole (51), wherein the upper cover (2) is provided with a hydraulic hole 1 (21) connected to the cavity (4), and wherein the lower cover (3) is provided with a hydraulic hole 2 (31) connected to the cavity (4).

2. A hydraulic cylinder according to claim 1, characterized in that: A ring-shaped sealing groove (511) is provided inside the through hole (51), and a U-shaped sealing ring (512) can be accommodated in the sealing groove (511). The U-shaped sealing ring (512) can be closely attached to the ejection piston rod (6) and the ejection piston rod (5).

3. A hydraulic cylinder according to claim 2, characterized in that: The lower cover (3) is provided with a groove (32) on the side facing the upper cover (2), and the ejection piston rod (6) can be inserted into the groove (32). The side of the groove (32) away from the ejection piston rod (6) is provided with an opening (321), and the side of the ejection piston rod (6) facing the groove (32) is provided with a threaded hole (61), and a screw (322) can be inserted through the opening (321) to fasten the ejection piston rod (6) in the groove (32).

4. A hydraulic cylinder according to claim 2, characterized in that: A second threaded hole (33) is provided on the side of the lower cover (3) facing the upper cover (2), and a thread (62) matching the second threaded hole (33) is provided on the end of the ejection piston rod (6) facing the lower cover (3), so that the ejection piston rod (6) can be fixed to the lower cover (3) through the second threaded hole (33).

5. A hydraulic cylinder according to claim 3 or 4, characterized in that: The cylinder sleeve (1) is provided with a hydraulic hole three (11).

6. A hydraulic cylinder according to claim 5, characterized in that: The cylinder sleeve (1) comprises an inner wall (12) and a contact surface (13); a boss (22) matching the cross section of the cavity (4) is provided on the side of the upper cover (2) facing the lower cover (3); a groove (221) is provided on the side of the boss (22) that contacts the cavity (4); an O-type sealing ring (23) can be placed in the groove (221); and a groove (24) is provided on the side of the upper cover (2) that contacts the contact surface (13); an O-type sealing ring (23) can be placed in the groove (24).

7. A hydraulic cylinder according to claim 6, characterized in that: The cylinder sleeve (1) comprises an inner wall (12) and a contact surface (13); a second boss (34) matching the cross section of the cavity (4) is provided on the side of the lower cover (3) facing the upper cover (2); a fourth groove (341) is provided on the side of the second boss (34) that is in contact with the cavity (4); an O-type sealing ring (23) can be placed in the fourth groove (341); and a fifth groove (35) is provided on the side of the lower cover (3) that is in contact with the contact surface (13); an O-type sealing ring (23) can be placed in the fifth groove (35).

8. A parallel combined hydraulic cylinder, comprising a hydraulic cylinder according to any one of claims 1 to 7, characterized in that: It also comprises a plate-shaped connecting portion (7), wherein the connecting portion (7) and the cylinder sleeve (1) connected in parallel are cast in an integrated manner.

9. The parallel combined hydraulic cylinder according to claim 8, characterized in that: The connecting portion (7) is provided with reinforcing ribs (71) on both sides that are not in contact with the cylinder sleeve (1), and the reinforcing ribs (71) are perpendicular to the movement direction of the ejection piston rod (5).

10. The parallel combined hydraulic cylinder according to claim 9, characterized in that: A fixing seat (72) is provided in the middle of the connecting portion (7), and the fixing seat (72) comprises a mounting end surface (721), and the flatness of the mounting end surface (721) is less than 0.05 mm.

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