CN219769026U - Oil tank and forming equipment - Google Patents

Abstract

The utility model provides an oil tank and forming equipment, wherein the oil tank is used for inputting oil into a mold closing oil cylinder during mold closing and comprises a tank body, an oil storage cavity and an oil draining cavity are arranged in the tank body, the oil storage cavity is provided with an oil conveying hole for supplying oil into and out of the oil storage cavity, the oil conveying hole is communicated with the mold closing oil cylinder, an oil draining hole is arranged between the oil storage cavity and the oil draining cavity, and the height of the oil draining hole is higher than that of the oil conveying hole. According to the oil tank and the forming equipment, when the oil tank is used for die assembly, the piston in the oil tank moves downwards, so that oil in the oil tank can quickly enter the oil tank through the oil delivery hole, the piston is assisted to move for die assembly, the problem of low die assembly efficiency caused by a long oil path is solved, and other pressurizing mechanisms are not needed, so that the overall structure of the forming equipment is simpler, and the cost is correspondingly reduced.

Description

Oil tank and forming equipment

Technical Field

The utility model belongs to the technical field of injection molding, and particularly relates to an oil tank and molding equipment.

Background

In order to make the mold locking stable and reliable in the existing injection molding machine, for example, a Chinese patent with the patent application number 200810163912.5 discloses a hydraulic mold locking injection molding machine, which comprises an injection device, a movable mold plate, a fixed mold plate and an ejection device which are arranged on a frame, wherein a mold is arranged in each mold plate, a mold opening and closing cylinder and a mold locking cylinder are arranged on the mold plate, a sliding block is arranged at the bottom of the movable mold plate, a sliding rail is arranged on the frame, the sliding block slides on the sliding rail along with the movable mold plate driven by the mold opening and closing cylinder, the mold locking cylinder is provided with an oil pipe, the oil pipe is communicated with a micro-pressure oil tank, a pressure boosting cylinder with a poor mounting surface is arranged on the oil pipe, a mold locking one-way valve is arranged between the oil pipe and the micro-pressure oil tank, the pressure boosting cylinder with a poor area comprises a low-pressure large oil cylinder and a high-pressure small oil cylinder, a pressurizing piston is arranged between the low-pressure large oil cylinder and the high-pressure small oil cylinder, and the oil pipe is connected with the high-pressure small oil cylinder, and the low-pressure large oil cylinder is connected with a system oil way. However, the conventional injection molding machine has a relatively complex structure, high cost and low mold closing efficiency.

Disclosure of Invention

The embodiment of the utility model aims to provide an oil tank and a forming mechanism, which are used for solving the technical problems of complex pressurization, high cost and lower die assembly efficiency of an injection molding machine in the prior art.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides an oil tank for input fluid in to the compound die hydro-cylinder when former compound die, the oil tank includes the box, be provided with oil storage chamber and drain cavity in the box, the oil storage chamber be provided with be used for with the defeated oil hole of compound die hydro-cylinder intercommunication, be provided with the drain hole between oil storage chamber and the drain cavity, the height of drain hole is higher than defeated oil hole's height.

Optionally, an exhaust hole is arranged at the cavity wall of the oil drainage cavity.

Optionally, an oil blocking wall is arranged in the oil discharging cavity and used for blocking oil in the oil discharging hole from being sprayed to the air discharging hole.

Optionally, the oil blocking wall is located between the oil drain hole and the air vent hole.

Optionally, the height of the position of the air vent is not lower than the height of the position of the oil drain hole.

Optionally, the oil tank further comprises a drain nozzle, and the drain nozzle is connected to the outside of the wall of the oil draining cavity and is communicated with the oil draining cavity.

Optionally, the oil tank further comprises an air filter, the oil storage cavity is provided with an air inlet hole, and the air filter is installed at the air inlet hole.

Optionally, an oil level observation window is arranged at the cavity wall of the oil storage cavity.

Optionally, a cleaning port of the oil tank is formed in the wall of the oil storage cavity, and a cleaning cover is arranged at the cleaning port of the oil tank.

The utility model also provides forming equipment, which comprises a forming device and the oil tank, wherein the forming device comprises a die closing oil cylinder and a piston arranged in the die closing oil cylinder, and the oil tank supplies oil to the die closing oil cylinder through the oil delivery hole and receives oil discharged from the die closing oil cylinder.

The oil tank and the forming mechanism provided by the utility model have the beneficial effects that: compared with the prior art, the oil tank is used for inputting oil into the die-closing oil cylinder during die-closing, and the piston in the die-closing oil cylinder moves downwards during die-closing of the die-closing oil cylinder, so that the oil in the oil tank can quickly enter the die-closing oil cylinder through the oil conveying hole to assist the piston to move and die, the problem of low die-closing efficiency caused by long oil path is solved, and other pressurizing mechanisms are not needed, so that the integral structure of the forming equipment is simpler, and the cost is correspondingly reduced. In addition, when the die is opened, oil can flow back into the oil tank, in order to ensure the consistency of oil quantity during each die assembly, an oil storage cavity and an oil drainage cavity are arranged in the tank, and when the oil quantity exceeds a certain quantity, excessive oil can flow from the oil storage cavity to the oil drainage cavity, so that the consistent pressure of the die assembly is ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a perspective view of an oil tank according to an embodiment of the present utility model;

FIG. 2 is a top view of a fuel tank provided by an embodiment of the present utility model;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a perspective view of a molding apparatus according to an embodiment of the present utility model;

FIG. 5 is a bottom view of a molding apparatus according to an embodiment of the present utility model;

fig. 6 is a cross-sectional view taken along line B-B in fig. 5.

Wherein, each reference sign in the figure:

1-an oil tank; 101-an oil conveying hole; 102-an air inlet hole; 103-exhaust holes; 104-oil drain nozzle; 11-an oil storage cavity; 12-an oil draining cavity; 13-a separator; 14-an oil drain hole; 15-oil blocking wall; 16-an air filter; 17-cleaning the cover; 18-oil level observation window; 21-a bracket; 22-a mold clamping mechanism; 221-pressing a template; 224-hydraulic cylinder; 231-a mold closing cylinder; 232-a piston; 24-an oil way control valve; 25-oil pumping mechanism.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model 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 for purposes of illustration only and are not intended to limit the scope of the utility model.

It will be understood that when an element is referred to as being "mounted" 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 is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Referring to fig. 1 and 6, an oil tank 1 according to an embodiment of the present utility model will be described. The oil tank 1 is used to supply oil into the mold clamping cylinder 231 when the molding equipment is clamped. The mold clamping cylinder 231 of the molding apparatus is used to drive the platen 221 to move, thereby performing mold clamping. A piston 232 is disposed in the mold clamping cylinder 231, and the piston 232 can be driven to move up and down by other mechanisms such as the hydraulic cylinder 224. The movement of the piston 232 may drive the movement of the die plate 221, thereby achieving the mold closing.

Specifically, when the mold clamping operation is performed, the piston 232 moves, the platen 221 is driven to move, the oil tank 1 is communicated with the inner cavity of the mold clamping cylinder 231, and when the piston 232 moves, the oil in the oil tank 1 enters the inner cavity of the mold clamping cylinder 231 to assist in pushing the piston 232 to move, so that the movement of the piston 232 can be faster, and the mold clamping efficiency is higher. The oil tank 1 is equivalent to a pressurizing mechanism when the piston 232 moves, and when the oil tank 1 is adopted, no additional pressurizing mechanism is needed, the structure of the whole mechanism is simpler, the oil tank 1 is more convenient for pressurizing transformation, and the pressurizing transformation cost is lower.

Referring to fig. 1 to 3, an oil tank 1 includes a tank body, an oil storage cavity 11 and an oil drainage cavity 12 are disposed in the tank body, the oil storage cavity 11 and the oil drainage cavity 12 are mutually communicated, and when oil in the oil storage cavity 11 is full, the oil automatically flows into the oil drainage cavity 12. The oil reservoir chamber 11 is provided with an oil delivery hole 101 so that oil can be delivered from the oil reservoir chamber 11 to the mold clamping cylinder 231. It will be understood that the oil delivery hole 101 on the oil storage chamber 11 is in communication with the mold clamping cylinder 231, and may specifically be in communication through a structure such as a pipe. An oil drain hole 14 is arranged between the oil storage cavity 11 and the oil drain cavity 12, and the oil drain hole 14 is arranged, so that when oil in the oil storage cavity 11 is fully stored, the oil can automatically move into the oil drain cavity 12 through the oil drain hole 14.

At the time of mold opening, the oil in the mold clamping cylinder 231 flows back into the oil tank 1. The height of the oil drain hole 14 is higher than the height of the oil delivery hole 101. Since the height of the oil drain hole 14 is higher than that of the oil delivery hole 101, excessive oil can be discharged through the oil drain hole 14 in the process of delivering oil to the oil storage cavity 11 through the oil delivery hole 101 (namely, in the process of returning oil) or in the process of delivering oil to the oil storage cavity 11 through other channels, so that the consistency of the oil quantity in each mold closing process is well ensured.

The oil tank 1 in the above embodiment is used for inputting oil into the mold clamping oil cylinder 231 during mold clamping, and the piston 232 in the mold clamping oil cylinder 231 moves downwards during mold clamping of the mold clamping oil cylinder 231, so that the oil in the oil tank 1 can quickly enter the mold clamping oil cylinder 231 through the oil conveying hole 101, the auxiliary piston 232 moves to mold the mold, the problem of low mold clamping efficiency caused by long oil path is solved, and other pressurizing mechanisms are not needed, so that the whole structure of the injection molding machine is simpler, and the cost is correspondingly reduced. In addition, when the mold is opened, oil flows back into the oil tank 1, in order to ensure the consistency of oil amount during each mold closing, an oil storage cavity 11 and an oil drainage cavity 12 are arranged in the tank, and when the oil amount exceeds a certain amount, excessive oil flows from the oil storage cavity 11 to the oil drainage cavity 12, so that the consistency of the mold closing pressure is ensured.

Optionally, the piston 232 divides the mold closing cylinder 231 into two cavities, when the piston 232 performs mold closing movement, one of the cavities is enlarged, the other cavity is reduced, and the oil delivery hole 101 is connected with the cavity which is enlarged when the mold closing cylinder 231 performs mold closing movement, so that when the piston 232 performs mold closing movement, the cavity communicated with the oil delivery hole 101 is enlarged, the internal pressure is reduced, and the oil in the oil tank 1 can automatically flow into the cavity without using an oil pushing mechanism, so that the overall structure of the molding equipment is simpler. In other embodiments, an oil pushing mechanism may be used to more quickly flow the oil in the oil reservoir 11 of the oil tank 1 into the clamp cylinder 231.

In one embodiment of the present utility model, referring to fig. 3, the oil storage chamber 11 and the oil drainage chamber 12 are separately arranged by a partition plate 13, the bottom end of the partition plate 13 is fixed at the bottom wall of the oil tank 1, and the top end of the partition plate 13 is spaced from the top wall of the oil tank 1, so that the oil in the oil storage chamber 11 flows toward the oil drainage chamber 12 when exceeding the capacity of the oil storage chamber 11. In this way, the gap between the top end of the partition 13 and the top wall of the oil tank 1 is the oil drain hole 14. Wherein the partition 13 extends from the bottom of the oil storage chamber 11 to the top of the oil storage chamber 11.

Alternatively, the inside of the oil tank 1 is provided with a partition plate 13, and the partition plate 13 is provided with an oil drain hole 14, so that the oil in the oil storage cavity 11 can flow to the oil drain cavity 12 when the oil is excessive.

In one embodiment of the present utility model, referring to fig. 1, the wall of the oil drainage cavity 12 is provided with the air vents 103, and the shape, number and distribution of the air vents 103 are not limited herein, so long as the oil drainage cavity 12 can communicate with the outside. The gas discharge hole 103 may be circular, square, etc. Alternatively, the wall of the oil draining cavity 12 is provided with an exhaust window, the exhaust window is provided with a silk screen, and holes on the silk screen are the exhaust holes 103. In order to prevent oil from leaking from the discharge hole 103, the discharge hole 103 is provided at the top or side of the discharge chamber 12 near the top. The exhaust hole 103 is arranged, so that in the process of conveying oil from the oil conveying hole 101 to the oil storage cavity 11, the exhaust can be realized through the exhaust hole 103, so that the oil conveying is smoother, and the air pressure in the oil discharge cavity 12 and the oil storage cavity 11 is prevented from obstructing the input of oil.

Alternatively, referring to fig. 1 and 3, the height of the position of the air vent 103 is not lower than the height of the position of the oil drain hole 14. Even when the oil reservoir 11 has been filled with oil, the level of oil in the oil tank 1 is only the level of the drain hole 14, since the remaining oil will enter the drain chamber 12 through the drain hole 14. Therefore, the height of the oil in the oil tank 1 does not exceed the position of the oil drain hole 14. When the height of the position of the air vent 103 is not lower than the height of the position of the oil drain hole 14, the oil height does not exceed the air vent 103, and the air vent 103 only serves as air exhaust, so that oil leakage is avoided. Therefore, the design of the gas exhaust air passage is more reasonable, the gas is more favorably exhausted from the exhaust passage, and the obstruction of oil to the exhaust of the gas can be reduced during the gas exhaust.

Optionally, referring to fig. 1 and 3, an oil blocking wall 15 is disposed inside the oil drain cavity 12, and the oil blocking wall 15 is used for blocking oil in the oil drain hole 14 from being sprayed toward the air drain hole 103, so as to leak oil. The oil blocking wall 15 is arranged opposite to the exhaust hole 103, and the oil blocking wall 15 and the side wall where the exhaust hole 103 is arranged at intervals, so that oil can be prevented from being sprayed to the exhaust hole 103, and normal exhaust of gas can be ensured. In one embodiment, the oil storage chamber 11 and the oil drainage chamber 12 are separately arranged through a partition plate 13, the bottom end of the partition plate 13 is fixed on the bottom wall of the oil tank 1, the top end of the partition plate 13 is arranged at intervals with the top wall of the oil tank 1, and a gap between the top end of the partition plate 13 and the top wall of the oil tank 1 is the oil drainage hole 14.

Alternatively, referring to fig. 3, the oil blocking wall 15 is disposed between the oil drain hole 14 and the air vent hole 103, so that a space structure is formed between the oil drain hole 14 and the air vent hole 103, when oil enters the oil drain cavity 12 from the oil storage cavity 11 through the oil drain hole 14, the oil tends to splash towards the air vent hole 103, and the oil splashing can be blocked more effectively by the blocking of the oil blocking wall 15 disposed between the oil drain hole 14 and the air vent hole 103. The oil blocking wall 15 extends downwards from the top wall of the oil drainage cavity 12 and is arranged opposite to the oil drainage hole 14, so that the oil splashing prevention effect is good.

In one embodiment of the present utility model, referring to fig. 3, the oil tank 1 further includes a drain nozzle 104, where the drain nozzle 104 is disposed on a wall of the oil drain chamber 12, and the drain nozzle 104 is in communication with the oil drain chamber 12 for draining oil in the oil drain chamber 12. In the normal use state of the fuel tank 1, the spout 104 is in a closed state. When the oil in the oil drainage cavity 12 is too much, and the oil needs to be drained, the external pipeline can be connected with the oil drain nozzle 104, and the oil drain nozzle 104 is opened to drain the oil in the oil drainage cavity 12 to a target storage container, so that the oil in the oil drainage cavity 12 is prevented from being too much or even leaking, and the use of a user is facilitated.

In one embodiment of the present utility model, referring to fig. 1 and 3, the fuel tank 1 further includes an air filter 16, the fuel storage chamber 11 is provided with an air intake hole 102, and the air filter 16 is mounted at the air intake hole 102. It is also understood that the air filter 16 is arranged in the oil reservoir 11. When oil is discharged from the oil delivery hole 101 of the oil storage cavity 11, air can be supplemented through the air inlet hole 102, so that oil discharge is smoother, air entering the oil storage cavity 11 through the air inlet hole 102 can be filtered through the air filter 16, and therefore the oil in the oil storage cavity 11 is not polluted.

In one embodiment of the present utility model, referring to fig. 1, an oil level observation window 18 is further provided on the tank body, and the oil level observation window 18 is provided to facilitate the observation of the amount of oil in the oil tank 1 from the outside. Alternatively, the oil level observation window 18 allows the oil level in the oil reservoir 11 to be observed; alternatively, the oil level observation window 18 allows the oil level in the drain chamber 12 to be observed; alternatively, one oil level observation window 18 can simultaneously enable the oil level in the drain chamber 12 and the oil reservoir chamber 11 to be observed; alternatively, the number of the oil level observation windows 18 is two, one of the oil level observation windows 18 being capable of observing the oil level of the oil reservoir 11, and the other oil level observation window 18 being capable of observing the oil level of the oil drain chamber 12. The specific shape of the oil level observation window 18 is not limited.

In one embodiment of the present utility model, referring to fig. 1, a cleaning opening of the oil tank 1 is provided at a wall of the oil storage chamber 11, a cleaning cover 17 is provided at the cleaning opening of the oil tank 1, and when the interior of the oil storage chamber 11 is dirty, the cleaning cover 17 can be opened to clean the interior of the oil storage chamber 11. The cleaning opening of the oil tank 1 and the cleaning cap 17 have the same shape, and may be square, circular, etc.

Referring to fig. 4 to 6, the present utility model further provides a forming apparatus, which includes the fuel tank 1 in any of the above embodiments, and further includes a forming device. The molding apparatus includes at least a mold clamping cylinder 231 and a piston 232, and the piston 232 is disposed inside the mold clamping cylinder 231. The oil tank 1 supplies oil to the mold clamping cylinder 231 through the oil feed hole 101 and receives oil discharged from the mold clamping cylinder 231.

Specifically, during mold closing, the piston 232 moves to drive the platen 221 to move, the oil tank 1 is communicated with the inner cavity of the mold closing cylinder 231, and when the piston 232 moves, oil in the oil tank 1 enters the inner cavity of the mold closing cylinder 231 through the oil delivery hole 101, and the piston 232 is assisted to be pushed to move, so that the movement of the piston 232 is faster, and the mold closing efficiency is higher. When the mold is opened, the piston 232 moves reversely, and the oil in the mold clamping cylinder 231 flows back into the oil tank 1 through the oil feed hole 101.

According to the molding equipment provided by the utility model, the oil tank 1 is adopted, the oil tank 1 is used for inputting oil into the mold clamping oil cylinder 231 during mold clamping, and the piston 232 in the mold clamping oil cylinder 231 moves downwards during mold clamping of the mold clamping oil cylinder 231, so that the oil in the oil tank 1 can rapidly enter the mold clamping oil cylinder 231 through the oil conveying hole 101, the auxiliary piston 232 moves to mold, the problem of low mold clamping efficiency caused by long oil paths is solved, and other pressurizing mechanisms are not needed, so that the whole structure of the injection molding machine is simpler, and the cost is correspondingly reduced. In addition, when the mold is opened, oil flows back into the oil tank 1, in order to ensure the consistency of oil amount during each mold closing, an oil storage cavity 11 and an oil drainage cavity 12 are arranged in the tank, and when the oil amount exceeds a certain amount, excessive oil flows from the oil storage cavity 11 to the oil drainage cavity 12, so that the consistency of the mold closing pressure is ensured.

In one embodiment of the present utility model, referring to fig. 4 to 6, the molding apparatus further includes a bracket 21, a clamping mechanism 22, an oil passage control valve 24, and an oil pumping mechanism 25. The support 21 is at least used for installing a die and a die clamping mechanism 22, the support 21 is an integral frame of injection molding equipment, and all components can be installed on the support 21.

The clamping mechanism 22 is used for clamping the mold, i.e., for pressing the mold. The clamping mechanism 22 is at least partially located above the bracket 21, the bracket 21 supports the clamping mechanism 22, and when the clamping mechanism 22 clamps the mold, the clamping mechanism 22 moves downward to clamp the mold. The clamping mechanism 22 includes at least a hydraulic cylinder 224 and a platen 221, the hydraulic cylinder 224 powering the movement of a piston 232, the platen 221 being an actuator of the clamping mechanism 22.

An oil delivery channel is arranged between the oil tank 1 and the die-closing oil cylinder 231, an oil channel control valve 24 is arranged between the die-closing oil cylinder 231 and the oil tank 1, the oil channel control valve 24 is used for controlling the on-off of an oil channel of the oil delivery channel, and the oil channel control valve 24 can be close to or arranged on the oil tank 1 or can be close to or arranged on the die-closing oil cylinder 231.

The oil pumping mechanism 25 is used for pumping oil into the mold clamping cylinder 231, and the oil pumping mechanism 25 is connected with the mold clamping cylinder 231 through a pipeline. When the oil pumping mechanism 25 is operated, oil enters the mold clamping cylinder 231, and at this time, the oil in the mold clamping cylinder 231 increases, and the piston 232 drives the mold clamping mechanism 22 to move downward to clamp the mold.

At the time of mold closing, the oil passage control valve 24 is opened, and the oil in the oil tank 1 enters the inside of the mold closing cylinder 231. When the oil in the oil tank 1 basically flows into the mold clamping cylinder 231, the oil passage control valve 24 is closed, the oil delivery passage is disconnected, the oil pumping mechanism 25 pumps high-pressure oil into the mold clamping cylinder 231, and when the oil passage between the oil pumping mechanism 25 and the mold clamping cylinder 231 is far, the piston 232 of the oil tank 1 can move downwards more rapidly, so that the mold clamping mechanism 22 moves downwards rapidly together, thereby improving mold clamping efficiency, and the structure is simple and the cost is low.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (10)

1. The oil tank is used for inputting oil into the mold closing oil cylinder when mold closing of molding equipment is performed, and is characterized by comprising a tank body, wherein an oil storage cavity and an oil drainage cavity are arranged in the tank body, the oil storage cavity is provided with an oil transportation hole communicated with the mold closing oil cylinder, an oil drainage hole is arranged between the oil storage cavity and the oil drainage cavity, and the height of the oil drainage hole is higher than that of the oil transportation hole.

2. The oil tank of claim 1, wherein the drain chamber has a vent hole provided in a chamber wall thereof.

3. The oil tank according to claim 2, wherein an oil blocking wall is provided in the oil drain chamber, the oil blocking wall being for blocking oil of the oil drain hole from being sprayed toward the air drain hole.

4. A fuel tank as claimed in claim 3, wherein the fuel barrier wall is located between the drain hole and the vent hole.

5. The oil tank according to claim 2, wherein the height of the vent hole is not lower than the height of the drain hole.

6. The fuel tank of any one of claims 1 to 5, further comprising a spout connected to the outside of the wall of the drain chamber and in communication with the drain chamber.

7. A fuel tank as claimed in any one of claims 1 to 5, wherein the fuel tank further comprises an air filter, the reservoir being provided with an air inlet aperture, the air filter being mounted at the air inlet aperture.

8. The oil tank according to any one of claims 1 to 5, wherein an oil level observation window is provided at a chamber wall of the oil reservoir chamber.

9. The fuel tank of any one of claims 1 to 5, wherein a tank cleaning port is provided at a wall of the reservoir chamber, and a cleaning cap is provided at the tank cleaning port.

10. A molding apparatus, characterized in that: comprising a molding device and the oil tank according to any one of claims 1 to 9, the molding device comprising a mold clamping cylinder and a piston provided in the mold clamping cylinder, the oil tank supplying oil to the mold clamping cylinder through the oil delivery hole and receiving oil discharged from the mold clamping cylinder.