CN215486951U

CN215486951U - Oil cylinder structure and injection molding machine

Info

Publication number: CN215486951U
Application number: CN202121449358.4U
Authority: CN
Inventors: 刘相尚; 潘玲玲; 刘卓铭; 魏瑜
Original assignee: Shenzhen Leadwell Technology Co Ltd
Current assignee: Guangdong Lijin Plastic Machinery Intelligent Manufacturing Co ltd
Priority date: 2021-06-25
Filing date: 2021-06-25
Publication date: 2022-01-11
Anticipated expiration: 2031-06-25

Abstract

The application provides a hydro-cylinder structure and injection molding machine, this hydro-cylinder structure includes following part: the unlocking die assembly comprises a first cylinder sleeve with a front cavity and a rear cavity and a first piston with an inner hole; the pressure maintaining assembly is arranged at one end of the first piston, which is far away from the movable plate, and is arranged in the rear cavity; the movable oil storage assembly comprises a second cylinder sleeve and a second piston; in a die closing motion state, the second piston is driven to move towards the movable plate, and hydraulic oil stored in the inner cavity of the second cylinder sleeve sequentially enters the rear cavity through an oil passing channel communicated with the first cylinder sleeve and the second cylinder sleeve and an inner hole communicated with the front cavity and the rear cavity; in a mode locking and pressure maintaining state, the pressure maintaining component blocks an inner hole; in the mold opening motion state, the first piston is driven to move towards the direction far away from the movable plate, and hydraulic oil in the rear cavity sequentially flows back to the inner cavity of the second cylinder sleeve through the inner hole and the oil passing channel. The application provides an oil cylinder structure can realize that the oil cylinder internal circulation mends oil to make the operation of injection molding machine convenient and fast more.

Description

Oil cylinder structure and injection molding machine

Technical Field

The application belongs to the technical field of injection molding machines, and more particularly relates to an oil cylinder structure and an injection molding machine.

Background

In the conventional injection molding machine, for example, a direct-pressure injection molding machine, generally includes a movable plate, a fixed plate, a high-pressure mold-locking cylinder assembly, and the like, wherein the high-pressure mold-locking cylinder assembly is mounted on a frame and connected to the movable plate, molds for molding are respectively mounted on the movable plate and the fixed plate, and a piston in the cylinder is pushed by oil pressure in the cylinder to move back and forth along an axial direction thereof, so as to drive the movable plate to move, so that the movable plate and the fixed plate reach a mold opening or mold closing state. Here, in order to smoothly realize the entire operation flow of the injection molding machine, such as the start-up pressure, the pressure holding, the mold opening, and the mold locking, oil pressure control is generally required. However, in the structural design of the oil cylinder of the existing injection molding machine, hydraulic oil needs to flow back to the oil tank through the oil valve, the oil pipe and the like, or hydraulic oil is supplied to the oil cylinder from the oil tank through the oil valve, the oil pipe and the like, which causes more time to be spent when the injection molding machine operates, and is not beneficial to improving the production efficiency; in addition, the existing oil cylinder structure needs to be externally connected with connecting parts such as an oil pipe, an oil valve and a joint, the structure is complex, and the occupied space is large.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of the application is to provide an oil cylinder structure to solve the technical problem that an injection molding machine in the prior art needs external oil pipe fuel valves and other external oil tanks to be communicated, so that production time is wasted and the structure and the space are complicated and occupy large.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: the utility model provides an oil cylinder structure for injection molding machine, this oil cylinder structure includes:

a movable plate is arranged on the base plate,

the unlocking die assembly comprises a first cylinder sleeve and a first piston; one end of the first piston is arranged in the inner cavity of the first cylinder sleeve, and the other end of the first piston extends out of the first cylinder sleeve and is fixedly connected with the movable plate; the inner cavity of the first cylinder sleeve is divided into a front cavity close to the movable plate and a rear cavity far away from the movable plate, and an inner hole for communicating the front cavity with the rear cavity is further formed in the first piston;

the pressure maintaining assembly is arranged at one end, far away from the movable plate, of the first piston and is arranged in the rear cavity; and the number of the first and second groups,

the movable oil storage assembly is arranged beside the unlocking die assembly and comprises a second cylinder sleeve and a second piston, one end of the second piston is arranged in an inner cavity of the second cylinder sleeve, and the other end of the second piston extends out of the second cylinder sleeve and is fixedly connected with the movable plate; the inner cavity of the second cylinder sleeve is communicated with the inner cavity of the first cylinder sleeve through an oil passage;

the oil cylinder structure has a die closing motion state, a die locking pressure maintaining state and a die opening motion state; in a mold closing motion state, the second piston is driven to move towards the movable plate along the axial direction of the second piston, and hydraulic oil stored in the inner cavity of the second cylinder sleeve sequentially enters the rear cavity through the oil channel and the inner hole; in a mode locking and pressure maintaining state, the pressure maintaining component blocks an inner hole; in the mold opening motion state, the first piston is driven to move in the direction far away from the movable plate along the axial direction of the first piston, the second piston moves in the same direction, and hydraulic oil in the rear cavity sequentially flows back to the inner cavity of the second cylinder sleeve through the inner hole and the oil passing channel.

Optionally, the number of the movable oil storage assemblies is multiple, and the multiple movable oil storage assemblies are respectively arranged on the periphery of the first cylinder sleeve.

Optionally, the two movable oil storage assemblies are symmetrically arranged on two sides of the first cylinder sleeve, and the axial direction of the second cylinder sleeve is parallel to the axial direction of the first cylinder sleeve.

Optionally, the movable oil storage assembly further includes a second front cover, the second front cover covers the front end opening of the second cylinder sleeve facing the movable plate, and the second piston penetrates through the second front cover and is then fixedly connected to the movable plate.

Optionally, a second piston copper bush is arranged on the second front cover, and the second piston copper bush is sleeved in the second front cover.

Optionally, the unlocking module further comprises a front cover plate and a rear cover plate, the first cylinder sleeve is cylindrical, the front cover plate covers the front end opening of the first cylinder sleeve facing the movable plate, and the rear cover plate covers the rear end opening of the first cylinder sleeve;

the unlocking die assembly further comprises a third piston, one end of the third piston is connected with the rear cover plate, and the other end of the third piston extends into the inner cavity of the first piston.

Optionally, the pressure maintaining assembly includes a positioning pressure sleeve and an oil sealing member, the positioning pressure sleeve is connected to an end face of the first piston, the end face of the first piston is far away from the movable plate, the oil sealing member is disposed on one side of the positioning pressure sleeve, the side faces the movable plate, and the oil sealing member is located between the positioning pressure sleeve and the first piston.

Optionally, the oil seal part is a movable ring, an oil seal inclined plane is arranged on the movable ring, the first piston abuts against the oil seal inclined plane in a mode locking and pressure maintaining state, and the front cavity and the rear cavity are isolated from each other; alternatively, the first and second electrodes may be,

the oil seal part is a butterfly valve, and in a mode locking pressure maintaining state, the first piston is abutted to the butterfly valve, and the front cavity and the rear cavity are isolated from each other.

Optionally, the unlocking die assembly further comprises a connecting plate, and one end of the first piston facing the movable plate is fixedly connected with the movable plate through the connecting plate.

The application also provides an injection molding machine, which comprises the oil cylinder structure.

The application provides an oil cylinder structure's beneficial effect lies in: compared with the prior art, in the oil cylinder structure, the movable oil storage component is arranged beside the first cylinder sleeve of the unlocking die component, so that in the actual operation of an injection molding machine, when the oil cylinder structure is in a die closing motion state, namely the injection molding machine is closing the die, the first piston and the second piston both move forwards, hydraulic oil originally stored in the second cylinder sleeve of the movable oil storage component enters a front cavity of the first cylinder sleeve through the oil passage, and then the hydraulic oil is further supplemented into a rear cavity of the first cylinder sleeve through the inner hole; after the die assembly is completed, the oil cylinder structure is in a die assembly state with a closed die, and at the moment, the pressure maintaining assembly is abutted with the first piston in a fit manner to block the inner hole so as to prevent the backflow of hydraulic oil in the rear cavity; then, the injection molding machine performs operations such as pressure maintaining, high pressure starting and the like, so that enough mold clamping force can be provided for the mold; when the oil cylinder structure is in a mold opening motion state, namely the injection molding machine is opening the mold, the first piston moves backwards through the pushing of the force of the oil pressure, the second piston also moves backwards along with the first piston, at the moment, the pressure maintaining assembly is separated from the first piston, the inner hole is opened again, hydraulic oil in the rear cavity enters the front cavity through the inner hole along with the movement of the first piston, and then flows back to the second cylinder sleeve of the movable oil storage assembly through the oil passage. According to the oil cylinder structure, the oil cylinder structure is actually designed to realize high-pressure mode locking through oil supplement inside the oil cylinder and internal circulation, and the oil supplement process of the internal circulation is completed through mutual matching among the unlocking module, the pressure maintaining module and the movable oil storage module. Therefore, compared with the design of the oil cylinder of the common injection molding machine at present, the oil cylinder structure does not need to be externally connected with connecting devices such as an oil pipe, an oil valve and a joint, and hydraulic oil does not need to flow back to the oil tank of the rack through an oil circuit board, an oil pipe and the like.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a top view of an oil cylinder structure provided in an embodiment of the present application;

FIG. 2 is a side view of a cylinder structure according to an embodiment of the present disclosure;

FIG. 3 is a cross-sectional view taken along the direction S-S in FIG. 2 (the cylinder structure is in a state where the mold opening movement is completed or the mold closing movement is about to be performed);

FIG. 4 is an enlarged schematic view at A in FIG. 3;

FIG. 5 is a cross-sectional view of the cylinder structure in an embodiment of the present disclosure when a mold closing motion is completed or a mold opening motion is about to occur;

fig. 6 is an enlarged schematic view of fig. 5 at B.

The reference numbers illustrate:

110. a movable plate; 200. unlocking the die assembly; 300. a pressure maintaining component; 400. a movable oil storage assembly; 210. a first cylinder liner; 220. a first piston; 240. a front cavity; 250. a rear cavity; 211. an inner bore; 410. a second cylinder liner; 420. a second piston; 500. an oil passing channel; 120. fixing a plate; 440. a second front cover; 450. a second piston copper bush; 441. a second connecting boss; 442. a second seal ring; 212. a front cover plate; 213. a rear cover plate; 262. a third piston; 214. a rear through hole; 310. positioning and pressing the sleeve; 320. an oil seal member; 321. an oil seal slope; 270. a connecting plate; 460. a connecting sleeve.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be 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 be indirectly connected to the other element.

It should be noted that the terms of orientation such as left, right, up and down in the embodiments of the present application are only relative to each other or are referred to the normal use state of the product, and should not be considered as limiting.

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

The embodiment of the application provides an oil cylinder structure and an injection molding machine with the same.

Referring to fig. 1, 3 and 5, in one embodiment, the cylinder structure includes a movable plate 110, an unlocking module 200, a pressure maintaining module 300 and a movable oil storage module 400. Specifically, the unlocking die assembly 200 includes a first cylinder sleeve 210 and a first piston 220; one end of the first piston 220 is disposed in the inner cavity of the first cylinder sleeve 210, and the other end of the first piston 220 extends out of the first cylinder sleeve 210 and is fixedly connected to the movable plate 110; the inner cavity of the first cylinder sleeve 210 is divided into a front cavity 240 adjacent to the movable plate 110 and a rear cavity 250 far from the movable plate 110, and the first piston 220 is further provided with an inner hole 211 communicating the front cavity 240 and the rear cavity 250. The pressure maintaining assembly 300 is provided at an end of the first piston 220 remote from the movable plate 110 and is built in the rear chamber 250. The movable oil storage assembly 400 is arranged beside the unlocking die assembly 200 and specifically comprises a second cylinder sleeve 410 and a second piston 420, one end of the second piston 420 is arranged in an inner cavity of the second cylinder sleeve 410, and the other end of the second piston 420 extends out of the second cylinder sleeve 410 and is fixedly connected with the movable plate 110; the inner cavity of the second cylinder jacket 410 and the inner cavity of the first cylinder jacket 210 communicate through the oil passage 500.

The oil cylinder structure has a mold closing motion state, a mold locking and pressure maintaining state and a mold opening motion state; in the mold closing motion state, the second piston 420 is driven to move towards the movable plate 110 along the axial direction of the second piston 420, and the hydraulic oil stored in the inner cavity of the second cylinder sleeve 410 sequentially enters the rear cavity 250 through the oil passage 500 and the inner hole 211; in a mode locking and pressure maintaining state, the pressure maintaining component 300 blocks the inner hole 211; in the mold opening motion state, the first piston 220 is driven to move in the direction away from the movable plate 110 along the axial direction of the first piston 220, the second piston 420 moves in the same direction, and the hydraulic oil in the rear cavity 250 sequentially flows back to the inner cavity of the second cylinder sleeve 410 through the inner hole 211 and the oil passage 500.

It should be noted that the oil cylinder structure is mainly suitable for an injection molding machine, particularly a direct-pressure injection molding machine, and of course, other types of injection molding machines with suitable structures can also be suitable for the technical scheme of the application. In the present embodiment, the axial direction of the first piston 220 is defined as the front-rear direction, and the direction from the first cylinder liner 210 toward the movable plate 110 is defined as the forward direction. Here, the injection molding machine includes a stationary plate 120 provided in front of the movable plate 110 in addition to the above-described components, and molds (not shown) for molding are mounted on the movable plate 110 and the stationary plate 120, respectively.

Based on the structural design, in the embodiment, because the movable oil storage assembly 400 is arranged beside the first cylinder sleeve 210 of the unlocking die assembly 200, in the actual operation of the injection molding machine, when the oil cylinder structure is in a die closing motion state, that is, the injection molding machine is closing the die, the first piston 220 and the second piston 420 both move forward, the hydraulic oil originally stored in the second cylinder sleeve 410 of the movable oil storage assembly 400 enters the front cavity 240 of the first cylinder sleeve 210 through the oil passage 500, and then the hydraulic oil is further supplemented into the rear cavity 250 of the first cylinder sleeve 210 through the inner hole 211; after the die assembly is completed, the oil cylinder structure is in a die assembly state with a closed die, and at the moment, the pressure maintaining assembly 300 is abutted with the first piston 220 in an attaching manner to seal the inner hole 211 so as to prevent the hydraulic oil in the rear cavity 250 from flowing back; then, the injection molding machine performs operations such as pressure maintaining, high pressure starting and the like, so that enough mold clamping force can be provided for the mold; when the oil cylinder structure is in a mold opening motion state, that is, the injection molding machine is opening the mold, the first piston 220 is pushed by the force of the oil pressure to move backwards, the second piston 420 also moves backwards, at this time, the pressure maintaining assembly 300 is separated from the first piston 220, the inner hole 211 is opened again, the hydraulic oil in the rear cavity 250 enters the front cavity 240 through the inner hole 211 along with the movement of the first piston 220, and then further flows back to the second cylinder sleeve 410 of the movable oil storage assembly 400 through the oil passage 500. According to the process, the oil cylinder structure is actually a structural design which realizes high-pressure mode locking through oil cylinder internal oil supplement and internal circulation, and the oil cylinder structure can complete the oil supplement process of the internal circulation through the mutual matching among the unlocking module assembly 200, the pressure maintaining assembly 300 and the movable oil storage assembly 400. Therefore, compared with the design of the oil cylinder of a common injection molding machine, the oil cylinder structure does not need to be externally connected with connecting devices such as an oil pipe, an oil valve and a joint, and also does not need to return hydraulic oil to the oil tank of the rack through an oil circuit board, the oil pipe and the like.

Referring to fig. 1 to 3, the number of the movable oil storage assemblies 400 is multiple, and the plurality of the movable oil storage assemblies 400 are respectively disposed at the periphery of the first cylinder sleeve 210. Of course, in other embodiments, only one movable oil storage assembly 400 may be provided, but the arrangement of a plurality of movable oil storage assemblies 400 not only can increase the oil storage capacity, but also can increase the oil supplementing speed through the simultaneous operation of the plurality of oil storage assemblies. As shown in fig. 2 and 3, in the present embodiment, the two movable oil storage assemblies 400 are symmetrically disposed on two sides of the first cylinder liner 210, so that a synchronous automatic oil replenishing process can be implemented by the movable oil storage assemblies 400 on two sides on the basis of a simple structure as much as possible. Here, the axial direction of the second cylinder sleeve 410 is parallel to the axial direction of the first cylinder sleeve 210, the axial direction of the first piston 220 is generally consistent with the axial direction of the first cylinder sleeve 210, and the axial direction of the second piston 420 is consistent with the axial direction of the second cylinder sleeve 410, so that the axial lines of the first piston 220 and the second piston 420 are also parallel, and the arrangement can better ensure the synchronous movement of the first piston 220 and the second piston 420, thereby being beneficial to improving the convenience of the internal automatic oil supplement of the oil cylinder structure. However, the design is not limited thereto, and the number and specific positions of the movable oil storage assemblies 400 may be set according to practical situations, and are not particularly limited thereto.

Further, referring to fig. 5 and 6, in the present embodiment, the movable oil storage assembly 400 further includes a second front cover 440, the second front cover 440 covers the front end opening of the second cylinder sleeve 410 facing the movable plate 110 to achieve the effect of sealing and sealing oil, and the second piston 420 penetrates through the second front cover 440 and is fixedly connected to the movable plate 110. Specifically, a connecting sleeve 460 is arranged at an opening at the front end of the second cylinder sleeve 410, one end of the connecting sleeve 460 is fixedly and hermetically connected with the front end of the second cylinder sleeve 410, and the other end of the connecting sleeve 460 is fixedly and hermetically connected with the second front cover 440; the second front cover 440 is provided with a second connecting boss 441 protruding backward on the inner side surface facing the second piston 420, and the second connecting boss 441 is embedded in the front end opening of the connecting sleeve 460, so that the oil sealing effect of the second front cover 440 can be effectively improved. In addition, an annular second sealing ring 442 is further inserted into an outer circumferential side surface of the second coupling boss 441 to further improve a sealing effect of the second front cover 440.

Further, as shown in fig. 6, in the present embodiment, a second piston copper boss 450 is disposed on the second front cover 440, and the second piston copper boss 450 is sleeved in the second front cover 440. It will be appreciated that as the first piston 220 moves back and forth in its axial direction, the second piston 420 moves with it, and the second piston brass 450 may function to limit travel and seal oil. Of course, in other embodiments, the second piston copper bush 450 may be replaced by other components having the same function, but in this embodiment, the second piston copper bush 450 is preferred because it has a better deformation force, which is more beneficial for the second piston 420 to move back and forth more conveniently on the premise of ensuring the sealing performance.

Referring to fig. 2 to 5, in the present embodiment, the unlocking module 200 further includes a front cover plate 212 and a rear cover plate 213, the first cylinder sleeve 210 is cylindrical, the front cover plate 212 covers the front end opening of the first cylinder sleeve 210 facing the movable plate 110, and the rear cover plate 213 covers the rear end opening of the first cylinder sleeve 210. Here, to realize the function of fast moving the mold, the mold-unlocking assembly 200 further includes a third piston 262, one end of the third piston 262 passes through the rear through hole 214 provided at the rear end of the first cylinder sleeve 210 and then is connected to the rear cover plate 213, and the other end of the third piston 262 extends into the inner cavity of the first piston 220. Specifically, the rear end of the piston rod of the third piston 262 is locked in the middle of the rear cover plate 213 through a nut, the front end of the piston rod of the third piston 262 is arranged in one of the cylinder cavities of the piston rod of the first piston 220, an oil port which is directly communicated with the bottom is arranged in the middle of the piston rod of the third piston 262, and the bottom surface of the cavity of the piston rod of the first piston 220 can be pushed by oil pressure, so that a mold closing state is achieved. In this embodiment, the pressure maintaining assembly 300 includes a positioning pressing sleeve 310 and an oil sealing member 320, the positioning pressing sleeve 310 is connected to an end surface of the first piston 220, which is far away from the movable plate 110, specifically, the positioning pressing sleeve 310 is fixedly connected to the first piston 220 through a screw, the oil sealing member 320 is disposed on a side of the positioning pressing sleeve 310 facing the movable plate 110, and the oil sealing member 320 is disposed between the positioning pressing sleeve 310 and the first piston 220 and can move back and forth. A through hole is formed at the front end of the first piston 220 adjacent to the positioning pressing sleeve 310, and when oil enters the through hole, the oil pressure pushes the inner side surface of the positioning pressing sleeve 310, and the first piston 220 and the positioning pressing sleeve 310 move towards the bottom of the rear cavity 250 of the first cylinder sleeve 210 at the same time, so as to achieve a mold opening state. In other words, the piston rod of the third piston 262 is fixed, and the function of fast mold moving is achieved only by pushing the piston rod of the first piston 220 by oil pressure.

Specifically, before the injection molding machine is ready to perform mold clamping and pressure maintaining, as shown in fig. 4 and 5, the oil seal 320 abuts against the first piston 220 so that the hydraulic oil in the rear cavity 250 does not flow out. However, after the mold closing is started, that is, when the oil cylinder structure is in a mold closing motion state, the oil seal member 320 moves to open the inner hole 211, and the front cavity 240 and the rear cavity 250 are communicated through the inner hole 211, so that hydraulic oil flowing out of the second cylinder sleeve 410 can sequentially pass through the oil passage 500, the front cavity 240 and the inner hole 211 and enter the rear cavity 250, and the oil supplementing process is smoothly realized. Here, an associated valve body may be provided in the oil passage 500 to obtain a better hydraulic oil flow direction control effect. When the injection molding machine is locked and pressure-maintaining, as shown in fig. 5, the positioning pressing sleeve 310 and the oil sealing member 320 both move to the bottom along with the first piston 220, and the oil sealing member 320 and the first piston 220 are attached to block the inner hole 211 through oil pressure, so that a good oil sealing effect is achieved. After the mold opening process is started, that is, when the oil cylinder structure is in a mold opening motion state, the oil sealing member 320 also moves to open the inner hole 211, the front cavity 240 and the rear cavity 250 are communicated through the inner hole 211, and then the first piston 220 is pushed to move backwards by the oil pressure in the third piston 262, of course, the second piston 420 also moves in the same direction, and at this time, the hydraulic oil in the rear cavity 250 can sequentially flow back to the second cylinder sleeve 410 of the movable oil storage assembly 400 through the inner hole 211, the front cavity 240 and the oil passage 500.

Specifically, as shown in fig. 4, in the present embodiment, the oil seal member 320 is a movable ring, the movable ring is provided with an oil seal slope 321, in the mold locking and pressure maintaining state, the first piston 220 abuts against the oil seal slope 321, and the front cavity 240 and the rear cavity 250 are isolated from each other, so that the effects of line and surface oil seal can be achieved, and further, the subsequent operations such as pressure maintaining and high pressure raising can be performed smoothly. However, the design is not limited thereto, and in other embodiments, the oil sealing member 320 may also be preferably a butterfly valve, and in the mode locking and pressure maintaining state, the first piston 220 abuts against the butterfly valve, and the front cavity 240 and the rear cavity 250 are isolated from each other, so that a good oil sealing effect can also be achieved.

Finally, referring to fig. 3 and 5, in the present embodiment, in order to improve the connection stability of the first piston 220 to the movable plate 110, the unlocking module 200 further includes a connecting plate 270, and one end of the first piston 220 facing the movable plate 110 is fixedly connected to the movable plate 110 through the connecting plate 270. Specifically, the connection plate 270 and the movable plate 110 may be, but not limited to, fixed by a screw connection or the like, so that the movable plate 110 can move back and forth by the first piston 220 when the first piston 220 is pushed by oil pressure. Meanwhile, since the second piston 420 of the movable oil storage assembly 400 is also fixedly connected to the movable plate 110, when the first piston 220 moves, the second piston 420 can also synchronously move in the same direction, thereby ensuring that the internal oil supply circulation process of the oil cylinder structure can be smoothly realized.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. The utility model provides an oil cylinder structure for injection molding machine, its characterized in that includes:

a movable plate is arranged on the base plate,

the unlocking die assembly comprises a first cylinder sleeve and a first piston; one end of the first piston is arranged in an inner cavity of the first cylinder sleeve, and the other end of the first piston extends out of the first cylinder sleeve and is fixedly connected with the movable plate; the inner cavity of the first cylinder sleeve is divided into a front cavity close to the movable plate and a rear cavity far away from the movable plate, and an inner hole for communicating the front cavity with the rear cavity is further formed in the first piston;

the oil cylinder structure has a die closing motion state, a die locking pressure maintaining state and a die opening motion state; in the mold closing motion state, the second piston is driven to move towards the movable plate along the axial direction of the second piston, and hydraulic oil stored in an inner cavity of the second cylinder sleeve sequentially enters the rear cavity through the oil passage and the inner hole; in the mode locking and pressure maintaining state, the pressure maintaining component blocks the inner hole; in the mold opening motion state, the first piston is driven to move in the direction far away from the movable plate along the axial direction of the first piston, the second piston moves in the same direction, and hydraulic oil in the rear cavity sequentially flows back to the inner cavity of the second cylinder sleeve through the inner hole and the oil passing channel.

2. The cylinder structure according to claim 1, wherein the number of the movable oil storage assemblies is plural, and the plural movable oil storage assemblies are separately provided on the periphery of the first cylinder liner.

3. The cylinder structure according to claim 2, wherein the two movable oil storage assemblies are symmetrically arranged on two sides of the first cylinder sleeve, and the axial direction of the second cylinder sleeve is parallel to the axial direction of the first cylinder sleeve.

4. The cylinder structure according to claim 1, wherein the movable oil storage assembly further comprises a second front cover, the second front cover covers a front end opening of the second cylinder sleeve facing the movable plate, and the second piston is fixedly connected with the movable plate after penetrating through the second front cover.

5. The cylinder structure according to claim 4, wherein a second piston copper bush is arranged on the second front cover, and the second piston copper bush is sleeved in the second front cover.

6. The cylinder structure according to any one of claims 1 to 5, wherein the unlocking die assembly further comprises a front cover plate and a rear cover plate, the first cylinder liner is cylindrical, the front cover plate covers the front end opening of the first cylinder liner facing the movable plate, and the rear cover plate covers the rear end opening of the first cylinder liner;

7. The cylinder structure according to any one of claims 1 to 5, wherein the pressure maintaining assembly includes a positioning pressure sleeve and an oil seal member, the positioning pressure sleeve is connected to an end surface of the first piston at an end remote from the movable plate, the oil seal member is provided on a side of the positioning pressure sleeve facing the movable plate, and the oil seal member is located between the positioning pressure sleeve and the first piston.

8. The cylinder structure according to claim 7, wherein the oil seal member is a movable ring, the movable ring is provided with an oil seal slope, the first piston abuts against the oil seal slope in the mode locking and pressure maintaining state, and the front cavity and the rear cavity are isolated from each other; alternatively, the first and second electrodes may be,

the oil seal piece is a butterfly valve, the first piston is abutted to the butterfly valve in a mode locking and pressure maintaining state, and the front cavity and the rear cavity are isolated from each other.

9. The cylinder structure according to any one of claims 1 to 5, wherein the unlocking die assembly further comprises a connecting plate, and an end of the first piston facing the movable plate is fixedly connected to the movable plate through the connecting plate.

10. An injection molding machine comprising the cylinder structure according to any one of claims 1 to 9.