An O-ring replacement system at the guide sleeve of a hydraulic press

Abstract

The present invention provides an O-ring replacement system at the guide sleeve of a hydraulic press, comprising: a base, a sliding seat, a top plate, a support seat, a support block, guide rods, a first communication component, a second communication component, a connection component and a jack. Four guide rods are installed on the base, and the tops of the guide rods are all connected to the top plate. The top plate is connected to the mounting ring of the hydraulic press. All the guide rods pass through the sliding seat located between the bottom plate and the top plate, and the sliding seat can move vertically under the guidance of the guide rods. A connection component is installed on the sliding seat, and the connection component is connected to the piston rod of the hydraulic press. A first communication component and a second communication component are installed on the top plate, and a support seat is installed on the bottom plate. A support block is detachably connected to the support seat, and the jack is used to be placed on the sliding seat to support the piston rod. The O-ring replacement system at the guide sleeve of the hydraulic press solves the problem in the prior art that it is difficult to replace the O-ring due to the tightness between the guide sleeve and the inner wall of the cavity.

Description

Technical Field

[0001] The invention relates to equipment for repairing a hydraulic press, in particular to an O-ring replacement system for a guide sleeve of a hydraulic press. Background Art

[0002] like Figure 1 As shown, the hydraulic press includes: a housing, a piston, a piston rod, a guide sleeve, an O-ring and a pressure plate. A cavity that can communicate with the outside is opened in the housing, a piston rod extends into the cavity, a piston is installed on the piston rod, the pistons are tightly attached to the inner wall of the cavity, the piston divides the cavity into a first oil chamber and a second oil chamber, a guide sleeve for closing the cavity is surrounded by the piston rod, the guide sleeve guides the movement of the piston rod, an O-ring is arranged between the guide sleeve and the inner wall of the cavity, a pressure plate is installed on the housing, the pressure plate blocks the guide sleeve in the cavity, the pressure plate is connected to the housing by a first screw, a mounting ring is protruded at the end of the housing away from the pressure plate, a threaded hole is opened on the mounting ring, the O-ring is easily damaged after long-term use, and the hydraulic machine will leak oil after damage, so it needs to be replaced, but when it is operated by hand, it is difficult to pull out the O-ring between the guide sleeve and the inner wall of the cavity in a day, and the operation is difficult. Summary of the invention

[0003] The present invention provides an O-ring replacement system for a hydraulic press guide sleeve, which solves the problem in the prior art that the O-ring replacement operation is difficult due to the tightness between the guide sleeve and the inner wall of the cavity.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] The present invention proposes an O-ring replacement system for a guide sleeve of a hydraulic press, comprising: a base, a sliding seat, a top plate, a support seat, a support block, a guide rod, a first connecting component, a second connecting component, a connecting component and a jack. Four guide rods are installed on the base, and the top ends of the guide rods are all connected to the top plate. The top plate is for the hydraulic press housing to pass through, and the top plate is connected to the hydraulic press mounting ring. All guide rods pass through the sliding seat located between the base and the top plate. The sliding seat can move in a vertical direction under the guidance of the guide rods. A connecting component is installed on the sliding seat, and the connecting component is connected to the piston rod of the hydraulic press. A first connecting component and a second connecting component are installed on the top plate. The first connecting component and the second connecting component are respectively used to connect a first inlet and outlet oil pipe and a second inlet and outlet oil pipe of the hydraulic press. A support seat is installed on the base, and a support block is detachably connected to the support seat. The support block is used to support the sliding seat. The sliding seat is used to receive the disassembled pressure plate and the guide sleeve. The jack is placed on the sliding seat to support the piston rod.

[0006] Compared with the prior art, the present invention has the following beneficial effects:

[0007] During disassembly, first, pass the hydraulic press housing through the top plate. Since the mounting ring protrudes more from the housing, the housing cannot pass through the top plate. The mounting ring is located above the top plate. The top plate is provided with a through hole for the first inlet and outlet oil pipes and the second inlet and outlet oil pipes to pass through; then, connect the mounting ring to the top plate through the third screw, and the first inlet and outlet oil pipes and the second inlet and outlet oil pipes are connected to the first oil chamber and the second oil chamber respectively. The first oil chamber is located on the side of the piston away from the guide sleeve, and the second oil chamber is located between the piston and the guide sleeve; subsequently, use the first connecting component and the second connecting component to connect the first inlet and outlet oil pipes and the second inlet and outlet oil pipes so that oil can be pumped into the first oil chamber and the oil in the second oil chamber can be pumped out, or the oil in the first oil chamber can be pumped out and oil can be pumped into the second oil chamber; then, connect the sliding seat through the connecting component The piston rod is connected; then, the oil in the first oil chamber is pumped out and the oil is pumped into the second oil chamber, so that there is no oil in the first oil chamber, and the piston rod moves to the top and maintains this state; then, a suitable support block is found according to the model of the hydraulic press, so the support block and the support seat need to be detachably connected to adapt to the replacement of O-rings on the guide sleeves of various hydraulic presses, so that the base supports the sliding seat through the support seat and the support block, and the support block cannot be too high or too low to ensure that the piston rod can be supported after the jack is placed in the piston rod and the sliding seat, and the pressure plate and the guide sleeve can be moved after the connecting assembly is separated from the piston rod; then, the connecting assembly is separated from the piston rod, so that the connecting assembly deviates from the bottom of the piston rod to prevent the connecting assembly from hindering the installation of the jack and the guide sleeve After the disassembly, the sliding seat falls a short distance and then falls on the support block; then, place the jack on the sliding seat, and the jack supports the piston rod; then, remove the two first screws connecting the pressure plate and the housing. There are at least 6 first screws. Use two first screws to screw into the installation positions of the two first screws just removed, screw a nut on each first screw, and then remove the remaining first screws; then, rotate the nut to slowly lower the position of the pressure plate until the pressure plate is close to the bottom end of the piston rod until the pressure plate falls; then, move the pressure plate to a position close to the jack, and use another jack to support the piston rod, and this jack is not within the pressure plate. Keep the jack against the piston rod. Since there is oil and pressure in the second oil chamber at this time, if the protection is suddenly lost, The force holding the piston rod from above causes the guide sleeve to lose the supporting force of the pressure plate, and it is very likely that the piston rod, the oil in the second oil chamber and the guide sleeve will move downward together. Therefore, the piston rod needs to be supported all the time; then, remove the jack in the pressure plate to disassemble the pressure plate; then, supply oil to the second oil chamber to achieve oil pressure to flush the guide sleeve out of the housing, and then slowly move the guide sleeve to the bottom end of the piston rod; then, remove the O-ring on the guide sleeve, and put on a new O-ring to replace the O-ring; then, slowly raise the guide sleeve and press the guide sleeve into the housing; then, put the pressure plate on the outside of the piston rod, slowly raise the pressure plate and put it on the outside of the housing; then, screw the first screw into the pressure plate and the housing to install the pressure plate, and the pressure plate blocks the guide sleeve in the housing.

[0008] Other advantages, objectives and features of the present invention will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present invention. Description of the Drawings

[0009] Figure 1 It is a sectional view of a hydraulic press;

[0010] Figure 2 It is a sectional view of an O-ring replacement system at the guide sleeve of the hydraulic press;

[0011] Figure 3 It is a top view at the sliding seat;

[0012] Figure 4 It is Figure 3 A schematic diagram after removing the buffer ring and the connecting ring in

[0013] Figure 5 An enlarged view at the first communication component;

[0014] Figure 6 An enlarged view at the second communication component.

[0015] Reference numerals: housing 10, piston 11, piston rod 12, guide sleeve 13, O-ring 14, pressing plate 15, base 21, sliding seat 22, top plate 23, support seat 24, support block 25, guide rod 26, rotating arm 27, rotating ring 270, first elastic member 28, hinge shaft 29, suspension bracket 20, buffer ring 30, first communication component 3, communication head 31, hose 32, sealing ring 33, first spring 34, second communication component 4, connection component 5, connection ring 51, support rod 52, second screw 53, support component 6, driving arm 61, arc-shaped block 62, first extrusion component 7, second extrusion component 8, frustum 81, second screw rod 82, elastic blocking component 9, wedge block 91, moving rod 92, second spring 93, roller 94, mounting seat 100. Detailed Embodiments

[0016] In order to make the technical means, creative features, achieved objectives and functions of the present invention clearer and easier to understand, the present invention will be further described below in conjunction with the drawings and specific embodiments.

[0017] As Figures 1 to 6As shown in the figure, the present invention provides an O-ring replacement system at the guide sleeve of a hydraulic press, including: a base 21, a sliding seat 22, a top plate 23, a support seat 24, a support block 25, a guide rod 26, a first communication component 3, a second communication component 4, a connection component 5, and a jack (not shown in the figure). Four guide rods 26 are installed on the base 21, and the tops of the guide rods 26 are all connected to the top plate 23. The top plate 23 allows the outer shell 10 of the hydraulic press to pass through, and the top plate 23 is connected to the mounting ring of the hydraulic press. All the guide rods 26 pass through the sliding seat 22 located between the base and the top plate 23. The sliding seat 22 can move vertically under the guidance of the guide rods 26. A connection component 5 is installed on the sliding seat 22, and the connection component 5 is connected to the piston rod 12 of the hydraulic press. A first communication component 3 and a second communication component 4 are installed on the top plate 23. The first communication component 3 and the second communication component 4 are respectively used to communicate with the first inlet and outlet oil pipes and the second inlet and outlet oil pipes of the hydraulic press. A support seat 24 is installed on the base, and a support block 25 is detachably connected to the support seat 24. The support block 25 is used to support the sliding seat 22. The sliding seat 22 is used to receive the removed pressure plate 15 and the guide sleeve 13. The jack is used to be placed on the sliding seat 22 to support the piston rod 12.

[0018] In order to achieve the detachable connection between the support block 25 and the support seat 24, and to realize the relative position positioning between the support block 25 and the support seat 24, to prevent the support block 25 from not supporting the place where the jack needs to be installed on the sliding seat 22 after installation, two T-shaped installation grooves are formed by the depression on the top surface of the support seat 24. A sliding foot is slidably installed in each installation groove, and a support block 25 is fixed to each sliding foot.

[0019] In order to enable the buffer ring 30 to automatically rotate to directly below the piston rod 12 after the connection component 5 is separated from the piston rod 12, so as to support the dropped pressure plate 15 and the guide sleeve 13, the hollow setting of the buffer ring 30 also provides an installation position for the installation of the jack, ensuring that the jack can be firmly supported by the sliding seat 22. A rotatable rotating ring 270 is installed on the sliding seat 22. The rotating ring 270 passes through and is fixed with a rotating arm 27. One end of the rotating arm 27 is installed with the connection component 5, and the other end of the rotating arm 27 is installed with the buffer ring 30. The buffer ring 30 is used to receive the removed pressure plate 15 and the guide sleeve 13. A first elastic member 28 is installed at the hinge joint between the rotating ring 270 and the sliding seat 22. Under the elastic force of the first elastic member 28, the buffer ring 30 can be kept directly below the piston rod 12.

[0020] The first elastic member 28 is a coil spring. An installation groove is formed by the depression on the inner wall of the rotating ring 270. The coil spring is wound in the installation groove. A hinge shaft 29 for guiding the rotation of the rotating ring 270 is installed on the sliding seat 22. The inner end of the coil spring is fixed to the hinge shaft 29, and the outer end of the coil spring is fixed to the inner wall of the installation groove.

[0021] In order to design a connection component 5 with a simple structure, the connection component 5 includes: a connection ring 51, two support rods 52, and a number of second screws 53. The connection ring 51 is connected to the piston rod 12 by the second screws 53. The connection ring 51 is connected with two support rods 52. A sliding groove for the two support rods 52 to slide is formed on the sliding seat 22. The sliding groove is arranged with the center line of the rotating ring 270 as the center of the circle. The connection ring 51 is fixed to one end of the rotating arm 27. The support rods 52 cannot be separated from the sliding seat 22. The support rods 52 can only slide on the sliding seat 22. The rotating ring 270 cannot be separated from the hinge shaft 29 in the vertical direction either. The rotating ring 270 can only rotate relative to the hinge shaft 29. In this way, when the piston rod 12 rises, the piston rod 12 can drive the sliding seat 22 to rise through the connection ring 51, the support rods 52, and the rotating ring 270. The setting of the support rods 52 avoids the easy breakage due to excessive force at the connection between the rotating ring 270 and the rotating arm 27, and improves the service life.

[0022] In order to avoid the jack and the buffer ring 30 being easily damaged because the sliding grooves supporting the jack and the buffer ring 30 are not filled during the use of the jack and the buffer ring 30, and to improve the service life of the jack and the buffer ring 30, a support component 6 is connected to the rotating ring 270. The support component 6 is opposite to the buffer ring 30. The support component 6 is used to fill the sliding groove when the buffer ring 30 is opposite to the piston rod 12.

[0023] In order to design a support component 6 with a simple structure and avoid the support component 6 affecting the rotation of the buffer ring 30 and the support rods 52, the support component 6 includes: a driving arm 61 and two arc-shaped blocks 62. The two arc-shaped blocks 62 are respectively arranged in the two sliding grooves. The surface of each arc-shaped block 62 and the surface of the sliding seat 22 are in the same plane. The driving arm 61 is connected to both arc-shaped blocks 62. The two arc-shaped blocks 62 support the buffer ring 30. The driving arm 61 is fixed to the rotating ring 270. Since the buffer ring 30, the driving arm 61, and the two arc-shaped blocks 62 are all fixed relative to the rotating ring 270, the two arc-shaped blocks 62 always support the buffer ring 30. At the same time, the top surface of the arc-shaped block 62 and the surface of the sliding seat 22 are in the same plane, ensuring that there is no step at the contact between the arc-shaped block 62 and the sliding seat 22.

[0024] In order to improve the maintenance efficiency, two hydraulic presses are installed on the top plate 23 at the same time. The two hydraulic presses are installed on the top plate 23 in a mirror-symmetrical manner. The first inlet and outlet oil pipes and the second inlet and outlet oil pipes are both located between the outer shells 10 of the two hydraulic presses.

[0025] In order to simultaneously connect the first inlet and outlet oil pipes of two hydraulic presses and improve the installation efficiency, a first extrusion assembly 7 is installed between the two first inlet and outlet oil pipes. The first extrusion assembly 7 acts on the two first connection assemblies 3. The first extrusion assembly 7 is used to respectively press the two first connection assemblies 3 against the two first inlet and outlet oil pipes. A second elastic member is provided inside the first connection assembly 3, and the second elastic member can keep the first connection assembly 3 away from the corresponding first inlet and outlet oil pipe.

[0026] In order to simultaneously connect the second inlet and outlet oil pipes of two hydraulic presses and further improve the installation efficiency, a second extrusion assembly 8 is installed between the two second inlet and outlet oil pipes. The second extrusion assembly 8 acts on the two second connection assemblies. The second extrusion assembly 8 is used to respectively press the two second connection assemblies 4 against the two second inlet and outlet oil pipes. A third elastic member is provided inside the second connection assembly 4, and the third elastic member can keep the second connection assembly 4 away from the corresponding second inlet and outlet oil pipe.

[0027] In order to avoid being hindered by excessive oil when pressing the guide sleeve 13 into the housing 10 and reduce the difficulty of pressing the guide sleeve 13 into the housing 10, each second connection assembly 4 is connected to a mounting seat 100, and each mounting seat 100 is provided with an elastic blocking assembly 9. The elastic blocking assembly 9 does not block the separation of the pressing plate 15 and the guide sleeve 13 from the housing 10. The elastic blocking assembly 9 is used to limit the approach of the guide sleeve 13 and the pressing plate 15 to the housing 10 when the second connection assembly 4 connects the second inlet and outlet oil pipes. The elastic blocking assembly 9 enables the guide sleeve 13 to approach the housing 10 only after the second inlet and outlet oil pipe is opened, avoiding the misoperation of allowing the guide sleeve 13 to approach the housing 10 without disconnecting the second inlet and outlet oil pipe. The design of the elastic blocking assembly 9 prompts the disconnection of the second inlet and outlet oil pipe.

[0028] Each first connection assembly 3 and second connection assembly 4 includes: a connection head 31, a hose 3211, a sealing ring 33, and a first spring 34. The first spring 34 is the second elastic member. One end of the connection head 31 is used to press against the first inlet and outlet oil pipe or the second inlet and outlet oil pipe. A step for pressing against the end face of the first inlet and outlet oil pipe or the second inlet and outlet oil pipe is provided on the inner wall of the connection head 31. The sealing ring 33 is installed on the step, and the sealing ring 33 is in close contact with the end face of the first inlet and outlet oil pipe or the second inlet and outlet oil pipe. The connection head 31 is L-shaped and can slide relative to the top plate 23. The other end of the connection head 31 is connected to one end of the hose 3211, and the hose 3211 allows the connection head 31 to slide relative to the top plate 23. The other end of the hose 3211 is connected to an oil pump. One end of the first spring 34 is fixed relative to the connection head 31, and the other end of the first spring 34 is fixed relative to the top plate 23. The first spring 34 is used to keep the connection head 31 away from the first inlet and outlet oil pipe or the second inlet and outlet oil pipe.

[0029] The second connection assembly 4 is installed on the suspension bracket 20, and the suspension bracket 20 is fixed on the top plate 23.

[0030] Both the first extrusion assembly 7 and the second extrusion assembly 8 include: a frustum 81 and a second screw 82. The frustum 81 is used to extrude the connecting heads 31 of two first communication assemblies 3 or two second communication assemblies 4. The large end of the frustum 81 is connected to the second screw 82, and the second screw 82 is threadedly connected to the corresponding top plate 23 or the suspension bracket 20.

[0031] The screw of the second extrusion assembly 8 is in the horizontal direction. The mounting seat 100 is fixed to the connecting head 31 of the second communication assembly 4, and the mounting seat 100 can move in a direction radially parallel to the piston rod 12 under the drive of the connecting head 31.

[0032] The elastic resistance assembly 9 includes: a wedge block 91, a moving rod 92, a second spring 93 and at least three rollers 94. The moving rod 92 passes through the mounting seat 100. The moving direction of the moving rod 92 relative to the mounting seat 100 is parallel to the moving direction of the connecting head 31 relative to the suspension bracket 20. One end of the moving rod 92 is fixed to the large end of the wedge block 91. The wedge block 91 is provided with an inclined surface facing the housing 10. At least three rollers 94 are mounted on the wedge block 91, and the rollers 94 protrude from the inclined surface. The rollers 94 can rotate and are used to contact the pressing plate 15 and the guide sleeve 13. The second spring 93 is the third elastic member. One end of the second spring 93 is fixed relative to the mounting seat 100, and the other end of the second spring 93 is fixed relative to the wedge block 91.

[0033] When the guide sleeve 13 or the pressing plate 15 is moved away from the housing 10, the guide sleeve 13 or the pressing plate 15 contacts the roller 94 on the inclined surface. The guide sleeve 13 or the pressing plate 15 presses the wedge block 91 to move away from the mounting seat 100 through the roller 94. Due to the inclination of the inclined surface, the wedge block 91 can be slowly pressed closer to the mounting seat 100, thereby allowing the guide sleeve 13 or the pressing plate 15 to cross over the wedge block 91. When the guide sleeve 13 is pressed into the housing 10, the guide sleeve 13 contacts the non-inclined surface of the wedge block 91, and the wedge block 91 cannot be slowly pressed closer to the mounting seat 100. The wedge block 91 does not allow the guide sleeve 13 to cross over. At this time, only by rotating the second screw 82 of the second extrusion assembly 8, under the elastic force of the first spring 34, the connecting head 31 drives the mounting seat 100 and the wedge block 91 to move away from the center line of the piston rod 12, so that the wedge block 91 deviates from the lifting and moving space of the guide sleeve 13 and the pressing plate 15, thus ensuring that the guide sleeve 13 can be reinstalled only after the second oil inlet and outlet pipe is opened, and reducing the difficulty of pressing the guide sleeve 13 into the housing 10.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A replacement system for the O-ring at the guide sleeve of a hydraulic press, characterized in that Including: A base, a sliding seat, a top plate, a support seat, a support block, guide rods, a first communication component, a second communication component, a connection component, and a jack. Four guide rods are installed on the base, and the tops of the guide rods are all connected to the top plate. The top plate allows the housing of the hydraulic press to pass through, and the top plate is connected to the mounting ring of the hydraulic press. All the guide rods pass through the sliding seat located between the base and the top plate, and the sliding seat can move vertically under the guidance of the guide rods. A connection component is installed on the sliding seat, and the connection component is connected to the piston rod of the hydraulic press. A first communication component and a second communication component are installed on the top plate. The first communication component and the second communication component are respectively used to communicate with the first inlet and outlet oil pipes and the second inlet and outlet oil pipes of the hydraulic press. A support seat is installed on the base, and a support block is detachably connected to the support seat. The support block is used to support the sliding seat. The sliding seat is used to receive the removed pressing plate and the guide sleeve. An O-ring is sleeved on the guide sleeve. The jack is used to be placed on the sliding seat to support the piston rod.

2. The O-ring replacement system at the guide sleeve of a hydraulic press according to claim 1, wherein The top surface of the support seat is recessed to form two T-shaped mounting grooves. A sliding foot is slidably installed in each mounting groove, and a support block is fixed to each sliding foot.

3. The O-ring replacement system at the guide sleeve of a hydraulic press according to claim 2, characterized in that, A rotatable rotating ring is installed on the sliding seat. The rotating ring passes through and is fixed with a rotating arm. One end of the rotating arm is installed with a connection component, and the other end of the rotating arm is installed with a buffer ring. The buffer ring is used to receive the removed pressing plate and the guide sleeve. A first elastic member is installed at the hinge joint between the rotating ring and the sliding seat. Under the elastic force of the first elastic member, the buffer ring can be kept directly below the piston rod.

4. A hydraulic press O-ring replacement system at the guide sleeve according to claim 3, characterized in that The connection component includes: a connection ring, two support rods, and several second screws. The connection ring is connected to the piston rod through the second screws. The connection ring is connected with two support rods. A sliding groove for the two support rods to slide is formed on the sliding seat, and the sliding groove is arranged with the center line of the rotating ring as the center of the circle.

5. The O-ring replacement system at the guide sleeve of a hydraulic press according to claim 4, characterized in that, A support component is connected to the rotating ring. The support component is opposite to the buffer ring. The support component is used to fill the sliding groove when the buffer ring is directly opposite to the piston rod.

6. The O-ring replacement system at the guide sleeve of a hydraulic press according to claim 5, characterized in that, The support component includes: a driving arm and two arc-shaped blocks. The two arc-shaped blocks are respectively arranged in the two sliding grooves. The surface of each arc-shaped block and the surface of the sliding seat are in the same plane. The driving arm is connected to both arc-shaped blocks. The two arc-shaped blocks support the buffer ring, and the driving arm is fixed to the rotating ring.

7. A hydraulic press O-ring replacement system at the guide sleeve according to claim 1, characterized in that, Two hydraulic presses are installed on the top plate in a mirror-symmetrical manner. The first inlet and outlet oil pipes and the second inlet and outlet oil pipes are both located between the housings of the two hydraulic presses.

8. A hydraulic press O-ring replacement system at the guide sleeve according to claim 7, characterized in that, A first extrusion component is installed between the two first inlet and outlet oil pipes. The first extrusion component acts on the two first communication components. The first extrusion component is used to press the two first communication components respectively against the two first inlet and outlet oil pipes. A second elastic member is arranged in the first communication component, and the second elastic member can keep the first communication component away from the corresponding first inlet and outlet oil pipe.

9. A O-ring replacement system at the guide sleeve of a hydraulic press according to claim 7, characterized in that A second extrusion component is installed between the two second inlet and outlet oil pipes. The second extrusion component acts on the two second communication components. The second extrusion component is used to press the two second communication components respectively against the two second inlet and outlet oil pipes. A third elastic member is arranged in the second communication component, and the third elastic member can keep the second communication component away from the corresponding second inlet and outlet oil pipe.

10. A hydraulic press O-ring replacement system at the guide sleeve according to claim 9, characterized in that, Each second connecting component is connected with a mounting seat, and each mounting seat is provided with an elastic blocking component. The elastic blocking component does not prevent the pressing plate and the guide sleeve from detaching from the housing, and the elastic blocking component is used to limit the approach of the guide sleeve and the pressing plate to the housing when the second connecting component connects the second inlet and outlet oil pipes.

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