Hydraulic cylinder oil supplement system and injection molding machine

Abstract

The application belongs to the technical field of injection molding machines, and particularly relates to a hydraulic oil cylinder oil supplement system and an injection molding machine. The hydraulic oil cylinder oil supplement system comprises: an oil cylinder comprising a rodless cavity and a rod cavity; a first oil tank and a second oil tank; a first electro-hydraulic valve comprising a first inlet, a first oil return pipeline opening, a first outlet and a second outlet, the first inlet being communicated with the first oil tank through a first oil inlet pipeline, the first oil return pipeline opening being communicated with the second oil tank through a first oil return pipeline, the first outlet being communicated with the rodless cavity through a first oil supply pipeline, and the second outlet being communicated with the rod cavity through a second oil supply pipeline; and a control valve, one end of which is communicated with the second oil tank through the first oil return pipeline, and the other end of which is communicated with the rodless cavity through the first oil supply pipeline, the control valve being capable of being opened to supplement oil to the rodless cavity when the injection molding machine is storing materials, and the control valve being capable of being closed when the injection molding machine is performing a glue extraction action. The application can effectively solve the problem of glue extraction delay, improve the production efficiency of the injection molding machine, and reduce the production cost.

Description

Technical Field

[0001] This application belongs to the field of injection molding machine technology, specifically relating to a hydraulic cylinder oil replenishment system and an injection molding machine. Background Technology

[0002] In the injection molding machine industry, electric melting is becoming a new trend due to its low energy consumption and high efficiency. However, existing electric melting hydraulic circuits in injection molding machines have significant defects: during material storage, the screw retraction drives the piston of the injection cylinder to the right, creating a negative pressure in the rodless chamber to draw in oil. However, because the upper limit of the negative pressure is -1 bar and the inlet orifice of the solenoid valve flowing into the rodless chamber is small, if the screw retraction speed is too fast, the rodless chamber cannot be filled with oil in time, creating a vacuum zone. During material extraction, the existence of the vacuum zone means that the oil must first fill the vacuum zone before it can push the piston, causing extraction delays. This cannot meet the high-efficiency production requirements of injection molding machines, affecting production efficiency and increasing production costs. Utility Model Content

[0003] The purpose of this application is to solve the problem in the prior art that the vacuum zone causes a delay in the extraction of glue, which cannot meet the high-efficiency production requirements of injection molding machines, thus affecting production efficiency and increasing production costs.

[0004] The first aspect of this application provides a hydraulic cylinder oil replenishment system for use in an injection molding machine. The hydraulic cylinder oil replenishment system includes: a cylinder, comprising a rodless chamber and a rod chamber; a first oil tank and a second oil tank; a first electro-hydraulic valve, comprising a first inlet, a first return oil port, a first outlet, and a second outlet, wherein the first inlet is connected to the first oil tank via a first inlet oil pipe, the first return oil port is connected to the second oil tank via a first return oil pipe, the first outlet is connected to the rodless chamber via a first supply oil pipe, and the second outlet is connected to the rod chamber via a second supply oil pipe; and a control valve, one end of which is connected to the second oil tank via the first return oil pipe, and the other end of which is connected to the rodless chamber via the first supply oil pipe. The control valve can be opened when the injection molding machine is storing material to replenish oil to the rodless chamber, and the control valve can be closed when the injection molding machine is performing a material extraction operation.

[0005] In one exemplary embodiment of this application, the control valve includes a control end, a first end, and a second end. The first end is connected to the second oil tank via the first return oil line, and the second end is connected to the rodless chamber via the first supply oil line. The hydraulic cylinder replenishment system further includes a control component, one end of which is connected to the first oil tank, and the other end is connected to the control end to control the opening and closing of the control valve.

[0006] In one exemplary embodiment of this application, the control component includes a second electro-hydraulic valve and a check valve. The second electro-hydraulic valve is connected to the first oil tank through the check valve. Hydraulic oil in the first oil tank can flow to the second electro-hydraulic valve through the check valve. The second electro-hydraulic valve is connected to the control terminal of the control valve to control the opening and closing of the control valve.

[0007] In one exemplary embodiment of this application, the control valve is a cartridge valve.

[0008] In one exemplary embodiment of this application, the second electro-hydraulic valve is a two-position four-way solenoid directional valve.

[0009] In one exemplary embodiment of this application, the hydraulic cylinder oil replenishment system further includes a third oil tank, the T port of the second electro-hydraulic valve is connected to the third oil tank, the P port of the second electro-hydraulic valve is connected to the first oil tank through the check valve, and the B port of the second electro-hydraulic valve is connected to the control terminal of the control valve.

[0010] In one exemplary embodiment of this application, the control valve includes an elastic element. When the hydraulic oil pressure output from port B of the second electro-hydraulic valve is lower than the pressure of the elastic element, the control valve opens; when the hydraulic oil pressure output from port B of the second electro-hydraulic valve is greater than or equal to the pressure of the elastic element, the control valve closes.

[0011] In one exemplary embodiment of this application, the first electro-hydraulic valve is an electro-hydraulic directional valve.

[0012] In one exemplary embodiment of this application, the first oil tank is a high-pressure oil circuit, and the second oil tank is a return oil circuit.

[0013] A second aspect of this application provides an injection molding machine, comprising: a screw; and a hydraulic cylinder replenishing system as described in any of the preceding claims, wherein the hydraulic cylinder replenishing system is connected to the screw to provide power for the linear reciprocating motion of the screw.

[0014] The hydraulic cylinder oil replenishment system and injection molding machine of this application have at least the following beneficial effects:

[0015] The hydraulic cylinder oil replenishment system includes a cylinder, a first oil tank, a second oil tank, a first electro-hydraulic valve, and a control valve. One end of the control valve is connected to the second oil tank through a first return oil line, and the other end is connected to the rodless chamber through a first supply oil line. The control valve can be opened when the injection molding machine is storing material, so that the hydraulic oil in the second oil tank can be supplied to the first supply oil line through the control valve in addition to the first return oil line and the first outlet line, increasing the amount of oil supplied to the rodless chamber. This allows the hydraulic oil to quickly fill the rodless chamber of the cylinder, avoiding the problem of delayed extraction during the extraction process. This meets the high-efficiency production requirements of the injection molding machine, improves production efficiency, and reduces production costs.

[0016] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0019] Figure 1 A schematic diagram of the connection between the hydraulic cylinder oil replenishment system and the screw provided in the embodiment of this application is shown.

[0020] Explanation of reference numerals in the attached figures:

[0021] 10. Injection molding machine; 100. Hydraulic cylinder replenishment system; 110. Cylinder; 111. Rodless chamber; 112. Rod chamber; 120. First oil tank; 130. Second oil tank; 140. First electro-hydraulic valve; 141. First control unit; 142. Second control unit; 150. Control valve; 160. First oil inlet line; 170. First oil return line; 180. First oil supply line; 190. Second oil supply line; 1100. Control component; 1110. Second electro-hydraulic valve; 1111. Third control unit; 1120. Check valve; 1200. Third oil tank; 200. Motor; 300. Screw. Detailed Implementation

[0022] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0023] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying 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 this application, "multiple" means two or more, unless otherwise explicitly specified.

[0024] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0025] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0026] Figure 1 A schematic diagram of the connection between the hydraulic cylinder oil replenishment system and the screw provided in the embodiment of this application is shown.

[0027] See Figure 1 As shown in the figure, this application provides a hydraulic cylinder replenishment system 100, which can be used in an injection molding machine 10. The hydraulic cylinder replenishment system 100 includes a cylinder 110, a first oil tank 120, a second oil tank 130, a first electro-hydraulic valve 140, and a control valve 150.

[0028] The injection molding machine 10 includes a motor 200, a barrel (not shown in the figure), and a screw 300 located inside the barrel. The barrel is responsible for melting, plasticizing, and temporarily storing the material during the injection molding process. The screw 300, located inside the barrel, provides strong support for material conveying and melting / plasticizing operations during injection molding. In the material storage stage, the screw 300 rotates under the drive of the motor 200, drawing plastic granules into the barrel. Simultaneously, the rotation of the screw 300 itself continuously stirs, compresses, and conveys the material within the barrel, allowing it to rub against the inner wall of the barrel and the surface of the screw 300, thus gradually completing the plasticizing process.

[0029] The inside of the barrel is smooth and has good thermal conductivity, ensuring that the material can be uniformly heated and melted under the action of the screw 300.

[0030] In some embodiments of this application, the hydraulic cylinder 110 is connected to the barrel via a connecting structure (not shown in the figure) to ensure that the power generated by the hydraulic cylinder 110 can be effectively transmitted to the screw 300, enabling the screw 300 to move back and forth and rotate smoothly within the barrel. The hydraulic cylinder 110 is equipped with an injection piston (not shown in the figure), which divides the internal space of the hydraulic cylinder 110 into a rodless chamber 111 and a rod chamber 112. The chamber on the side where the piston rod is installed is the rod chamber 112, and the chamber on the side where the piston rod is not installed is the rodless chamber 111.

[0031] It should be noted that the hydraulic cylinder 110 is the power source for the linear reciprocating motion of the screw 300. During material storage, the movement of the injection piston drives the screw 300 backward. Hydraulic oil enters the rodless chamber 111 of the hydraulic cylinder 110, and the screw 300 entrains plastic granules into the barrel. The compression of the plastic causes the right end of the screw to move. During this process, the backward speed of the screw 300 is related to the speed at which the screw entrains the plastic granules into the barrel; the faster the plastic granules are entrained into the barrel, the faster the backward speed of the screw 300. When the injection molding machine 10 is pumping out the molten material, the action of the hydraulic cylinder 110 also drives the screw 300. During injection, the hydraulic cylinder 110 pushes the screw 300 forward, injecting the molten material in the barrel into the mold; during pumping out the molten material, the hydraulic cylinder 110 pushes the piston to drive the screw 300 backward, adjusting the amount of molten material at the front end of the screw 300 to ensure injection accuracy.

[0032] The first electro-hydraulic valve 140 is an electro-hydraulic directional valve, which includes a first inlet (P), a first return oil line port (T), a first outlet (A) and a second outlet (B), and a first control unit 141 and a second control unit 142 are respectively provided at its opposite ends.

[0033] In some embodiments of this application, the first oil tank 120 can be a high-pressure oil circuit; the second oil tank 130 can be a return oil circuit. See also Figure 1As shown, the first inlet (P) can be connected to the first oil tank 120 through the first oil inlet line 160, the first oil return line can be connected to the second oil tank 130 through the first oil return line 170, the first outlet can be connected to the rodless chamber 111 of the cylinder 110 through the first oil supply line 180, and the second outlet can be connected to the rod chamber 112 through the second oil supply line 190.

[0034] Understandably, the high-pressure oil tank, as the power source of the entire injection molding machine's hydraulic system, provides energy to all the actuators. (See also...) Figure 1 As shown, when the injection molding machine 10 performs the extraction action, the first control unit 141 of the first electro-hydraulic valve 140 is energized. High-pressure oil enters the rodless chamber 111 through the first oil inlet pipe 160, the first inlet (P) of the first electro-hydraulic valve 140, and the first outlet (A) of the first electro-hydraulic valve 140, pushing the injection piston inside the cylinder 110 backward, thereby driving the screw 300 to retract and realize the extraction operation. High-pressure oil also ensures the stability and reliability of various actions of the injection molding machine 10 during operation, enabling the injection molding machine 10 to accurately complete various complex actions under high-pressure and high-speed working conditions, thereby improving production efficiency and product quality.

[0035] In addition, the return oil tank mainly serves to recover and store hydraulic oil. During the material storage process of the injection molding machine 10, the screw 300 retracts, causing the piston of the injection cylinder 110 to move to the right. A negative pressure is created in the rodless chamber 111. At this time, the hydraulic oil in the return oil tank is replenished into the rodless chamber 111 through the second inlet (T) and first outlet (A) of the first electro-hydraulic valve 140, providing hydraulic support for the movement of the cylinder 110. The return oil tank also provides preliminary cooling and filtration of the hydraulic oil, removing impurities and heat, ensuring the cleanliness and performance of the hydraulic oil, extending the service life of the hydraulic system, and ensuring the normal operation of the entire hydraulic circuit system.

[0036] In some embodiments of this application, see Figure 1 As shown, one end of the control valve 150 is connected to the second oil tank 130 through the first oil return line 170, and the other end is connected to the rodless chamber 111 through the first oil supply line 180. The control valve 150 can be opened when the injection molding machine 10 is storing material to replenish oil to the rodless chamber 111, and the control valve 150 can be closed when the injection molding machine 10 is performing the extraction action.

[0037] In other words, during material storage, not only does hydraulic oil flow to the rodless chamber 111 through the first return oil port (T) and the first outlet (A) of the first electro-hydraulic valve 140, but also hydraulic oil flows to the rodless chamber 111 through the control valve 150. This allows the hydraulic oil to quickly fill the rodless chamber 111 during the material storage process of the injection molding machine 10, avoiding the phenomenon of delayed extraction and ensuring the production efficiency of the injection molding machine 10, thereby enabling the injection molding machine 10 to meet the needs of high-efficiency production.

[0038] The control valve 150 can be a solenoid directional valve, a proportional directional valve, an electro-hydraulic directional valve, a cartridge valve, etc.

[0039] In some embodiments of this application, the control valve 150 may be a normally open cartridge valve. See also Figure 1 As shown, this control valve 150 may include a control terminal (not shown in the figure), a first terminal (not shown in the figure), and a second terminal (not shown in the figure). The first terminal of the control valve 150 is connected to the second oil tank 130 through the first return oil line 170, and the second terminal of the control valve 150 is connected to the rodless chamber 111 through the first supply oil line 180. See also Figure 1 As shown, the hydraulic cylinder oil replenishment system 100 also includes a control component 1100. One end of the control component 1100 is connected to the first oil tank 120, and the other end of the control component 1100 is connected to the control end of the control valve 150 to control whether the control valve 150 is in an open or closed state.

[0040] Understandably, when the control valve 150 is in the open state, the hydraulic oil in the return oil tank can flow not only to the rodless chamber 111 through the first electro-hydraulic valve 140, but also to the rodless chamber 111 through the control valve 150. This ensures that the hydraulic oil can quickly fill the rodless chamber 111 during the material storage process of the injection molding machine 10, preventing the rodless chamber 111 from forming a vacuum zone due to untimely oil replenishment, thereby ensuring the production efficiency of the injection molding machine 10.

[0041] When the injection molding machine 10 is in the extraction action, the control valve 150 is closed to prevent hydraulic oil from flowing back during the extraction process, ensuring that the oil flows along the set path, so that the oil enters the first outlet (A) through the first inlet (P) of the first electro-hydraulic valve 140, pushing the injection piston to move backward and successfully completing the extraction action.

[0042] In some embodiments of this application, see Figure 1 As shown, the control assembly 1100 includes a second electro-hydraulic valve 1110 and a check valve 1120. The second electro-hydraulic valve 1110 is connected to the first oil tank 120 through the check valve 1120, and the hydraulic oil in the first oil tank 120 can flow to the second electro-hydraulic valve 1110 through the check valve 1120. The second electro-hydraulic valve 1110 is connected to the control terminal of the control valve 150 so that the control valve 150 is in an open or closed state.

[0043] The second electro-hydraulic valve 1110 is a two-position four-way solenoid directional valve. When the injection molding machine 10 is in the dispensing action, the second electro-hydraulic valve 1110 keeps the control valve 150 in the closed state; when the injection molding machine 10 is in the material storage state, the second electro-hydraulic valve 1110 keeps the control valve 150 in the open state. The check valve can effectively ensure the stability of the hydraulic oil pressure in the control chamber of the control valve, thereby ensuring the stable operation of the valve.

[0044] In some embodiments of this application, the control valve 150 includes a valve core (not shown in the figure), a valve sleeve (not shown in the figure), and an elastic element (not shown in the figure). The valve core can move within the valve sleeve to achieve on / off control of the oil circuit. A specific area is provided on the valve sleeve. When the valve core is in different positions, this area and the valve core together enclose a relatively closed space, which is the control chamber (not shown in the figure).

[0045] The elastic element can be a spring. The elastic element is located within the valve sleeve control cavity, with one end abutting against the inner wall of the valve sleeve and the other end contacting the valve core. Under normal conditions, the spring is in a certain pre-compression state, applying an initial force to the valve core, keeping the valve core in the normally open or normally closed position.

[0046] For example, in the normally open control valve 150, under normal conditions, the elastic force of the elastic element keeps the valve core in the open position, ensuring that hydraulic oil can flow into the rodless chamber 111 so that the oil can smoothly and quickly fill the rodless chamber 111 when storing material. When it is necessary to change the operating state of the control valve 150, the second electro-hydraulic valve 1110 controls the oil to enter the control chamber, and the resulting pressure overcomes the elastic force of the elastic element, pushing the valve core to move, thereby realizing the valve's closing or opening action.

[0047] The working principle of control valve 150 is to control the flow of oil by changing the position of the valve core within the valve sleeve. When the pressure in the control chamber changes, the valve core, under the action of pressure and elastic elements, changes the relative position between the valve core and the valve sleeve, thereby controlling the flow direction and flow rate of the oil.

[0048] In some embodiments of this application, see Figure 1 As shown, the second electro-hydraulic valve 1110 includes a third control unit 1111, a P port, a T port, an A port, and a B port. When a glue extraction action is required, the second electro-hydraulic valve 1110 activates. The third control unit 1111 of the second electro-hydraulic valve 1110 is energized, and hydraulic oil enters from the P port of the second electro-hydraulic valve 1110 into the B port, and then enters the control chamber of the control valve 150, at which point the control valve 150 closes. This is to prevent backflow of hydraulic oil during the glue extraction process, ensuring that the oil flows along the set path, allowing the oil to enter the first outlet (A) of the first electro-hydraulic valve 140 through the first inlet (P) port, pushing the injection piston backward and smoothly completing the glue extraction action.

[0049] It is understandable that when the hydraulic oil pressure output from the second electro-hydraulic valve 1110B port is lower than the pressure of the elastic element, the control valve 150 is in the open state; when the hydraulic oil pressure output from the second electro-hydraulic valve 1110B port is greater than or equal to the pressure of the elastic element, the control valve 150 is in the closed state.

[0050] In some embodiments of this application, see Figure 1As shown, the hydraulic cylinder oil replenishment system 100 also includes a third oil tank 1200, which is connected to the T port of the second electro-hydraulic valve 1110 to realize the recycling of oil and help maintain the balance and stability of the oil in the system.

[0051] It is worth mentioning that the hydraulic cylinder oil replenishment system 100 may also include a pressure sensor (not shown in the figure) and a flow sensor (not shown in the figure), which are respectively installed in the rodless chamber 111 and key oil circuit nodes to monitor pressure and flow data in real time. This data is fed back to the control system, which uses a PID control algorithm to adjust the servo motor speed, thereby achieving precise control of oil pressure and flow.

[0052] See Figure 1 As shown, this application embodiment also provides an injection molding machine 10, which includes a screw 300 and a hydraulic cylinder replenishing system 100 of any of the above. The hydraulic cylinder replenishing system 100 is connected to the screw 300 to provide stable and reliable power support for the operation of the screw 300.

[0053] In the description of this specification, references to terms such as "some embodiments," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. A hydraulic cylinder oil supplementing system applied to an injection molding machine, characterized in that, The hydraulic cylinder oil replenishment system includes: Hydraulic cylinder, including rodless chamber and rod chamber; First fuel tank and second fuel tank; The first electro-hydraulic valve includes a first inlet, a first return oil line port, a first outlet, and a second outlet. The first inlet is connected to the first oil tank through a first oil inlet line, the first return oil line port is connected to the second oil tank through a first return oil line, the first outlet is connected to the rodless chamber through a first oil supply line, and the second outlet is connected to the rod chamber through a second oil supply line. The control valve has one end connected to the second oil tank through the first return oil line and the other end connected to the rodless chamber through the first supply oil line. The control valve can be opened when the injection molding machine is storing material to replenish oil to the rodless chamber, and the control valve can be closed when the injection molding machine is performing the extraction action.

2. The hydraulic cylinder top-up system of claim 1, wherein, The control valve includes a control end, a first end, and a second end. The first end is connected to the second oil tank through the first return oil line, and the second end is connected to the rodless chamber through the first supply oil line. The hydraulic cylinder oil replenishment system also includes a control component, one end of which is connected to the first oil tank and the other end is connected to the control terminal to control the opening and closing of the control valve.

3. The hydraulic cylinder top-up system of claim 2, wherein, The control component includes a second electro-hydraulic valve and a check valve. The second electro-hydraulic valve is connected to the first oil tank through the check valve. Hydraulic oil in the first oil tank can flow to the second electro-hydraulic valve through the check valve. The second electro-hydraulic valve is connected to the control terminal of the control valve to control the opening and closing of the control valve.

4. The hydraulic cylinder top-up system of claim 2, wherein, The control valve is a cartridge valve.

5. The hydraulic cylinder oil replenishment system according to claim 3, characterized in that, The second electro-hydraulic valve is a two-position four-way solenoid directional valve.

6. The hydraulic cylinder oil replenishment system according to claim 5, characterized in that, The hydraulic cylinder oil replenishment system also includes a third oil tank. The T port of the second electro-hydraulic valve is connected to the third oil tank, the P port of the second electro-hydraulic valve is connected to the first oil tank through the check valve, and the B port of the second electro-hydraulic valve is connected to the control terminal of the control valve.

7. The hydraulic cylinder oil replenishment system according to claim 6, characterized in that, The control valve includes an elastic element. When the hydraulic oil pressure output from port B of the second electro-hydraulic valve is lower than the pressure of the elastic element, the control valve opens; when the hydraulic oil pressure output from port B of the second electro-hydraulic valve is greater than or equal to the pressure of the elastic element, the control valve closes.

8. The hydraulic cylinder oil replenishment system according to claim 1, characterized in that, The first electro-hydraulic valve is an electro-hydraulic directional valve.

9. The hydraulic cylinder oil replenishment system according to claim 8, characterized in that, The first oil tank is a high-pressure oil circuit, and the second oil tank is a return oil circuit.

10. An injection molding machine, characterized in that, include: Screw; The hydraulic cylinder oil replenishment system according to any one of claims 1 to 9, wherein the hydraulic cylinder oil replenishment system is connected to the screw to provide power for the linear reciprocating motion of the screw.

Images