A method of installing a plunger

Abstract

The application provides a mounting method of a plunger, S1, guiding bands with openings are respectively mounted in two or more mounting grooves of a cylinder body, the openings of the two or more guiding bands are arranged in a staggered manner, S2, a conical avoiding part of a guide piece is inserted into an inlet end of the cylinder body, S3, one end of the plunger is abutted against one end of the guide piece away from the conical avoiding part, S4, the plunger is pushed to move, the plunger pushes the guide piece to move towards an outlet end of the cylinder body, S5, when the guide piece contacts the guiding band, the conical avoiding part of the guide piece generates an upward supporting force on the guide piece to press the guide piece in the mounting groove, S6, the plunger is continuously pushed to move, after the conical avoiding part is staggered with the guiding band, the guide piece limits the guiding band in the mounting groove, S7, the plunger is continuously pushed to move, when the plunger is aligned with the guide piece, the guide piece is pulled out of the cylinder body through a pull rod, and the guide piece limits the guiding band in the mounting groove when moving, so that the guiding band is prevented from moving along with the guide piece and being damaged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic oil cylinder, in particular to a mounting method of plunger. BACKGROUND

[0002] The hydraulic oil cylinder is mainly applied to equipment machinery, is the most important component of equipment engineering machinery, and is an important core element for providing power for equipment machinery. However, the plunger in the hydraulic oil cylinder is difficult to install, and the guide belt is easily damaged during the installation of the plunger.

[0003] A kind of hydraulic cylinder piston sealing conical installation guide sleeve device is disclosed in the patent document with Chinese application number 201922263375.8 and publication date of 2020.9.25, comprising a piston rod, one end of the piston rod is provided with a piston rod connector, the outer surface of the other end of the piston rod is fixedly sleeved with a piston, the outer surface of the piston is provided with a piston guide ring at middle position, and the both sides of the piston guide ring are provided with sealing elements, the outer surface of the sealing element is movably sleeved with an installation guide sleeve, and the outer surface of the end of the installation guide sleeve away from the piston rod connector is sleeved with a hydraulic cylinder barrel;After the tapered end of the installation guide sleeve is aligned with the hydraulic cylinder barrel, the piston and the sealing element are sent into the cylinder body.

[0004] The guide sleeve device only inserts one end of the installation guide sleeve into the hydraulic cylinder barrel during the installation of the piston, provides guidance for the piston entering the hydraulic cylinder barrel, and still needs to move in the hydraulic cylinder barrel after the piston is separated from the installation guide sleeve, so that the guide sleeve cannot provide guidance for the movement of the piston after the piston is separated from the guide sleeve. At the same time, the piston guide ring will move relative to the piston under the friction between the piston and the hydraulic cylinder barrel, causing the position of the piston guide ring to change. SUMMARY

[0005] The present application provides a mounting method of plunger, which limits the guide belt in the installation groove when the guide piece moves, avoiding damage caused by the guide belt moving with the guide piece.

[0006] To achieve the above purpose, the technical scheme of the present application is as follows: a mounting method of plunger, comprising the following steps:

[0007] S1, installing a guide belt with an opening in each of two or more installation grooves of the oil cylinder barrel, and the openings of the two or more guide belts are arranged in a staggered manner.

[0008] S2, extending the conical avoiding part of the guide piece into the inlet end of the oil cylinder barrel.

[0009] S3, abutting one end of the plunger with the end of the guide piece away from the conical avoiding part.

[0010] S4, moving the plunger, and the plunger moves the guide piece towards the outlet end of the oil cylinder barrel.

[0011] S5, when the guide is in contact with the guide belt, the conical avoidance part of the guide generates an upward supporting force on the guide belt to press the guide belt in the installation groove.

[0012] S6, continue to push the plunger to move, after the conical avoidance part is dislocated with the guide belt, the guide restricts the guide belt in the installation groove.

[0013] S7, continue to push the plunger to move, when the plunger is in alignment with the guide, the guide is pulled out of the oil cylinder body through the pull rod.

[0014] The above method, by installing the guide belt with opening, the installation is simple, at the same time, the guide belt avoids interfering with the plunger activity; at the same time, the opening of the guide belt is dislocated, the openings of adjacent guide belts are not on the same straight line, in the circumferential direction of the plunger, different positions of the plunger can be contacted with the oil cylinder body through the guide, reducing the wear between the plunger and the oil cylinder body. The width of the conical avoidance part is less than the width of the guide, the conical avoidance part of the guide is first inserted into the inlet end, which facilitates the cooperation between the guide and the oil cylinder body, then the plunger is attached to the guide and the plunger is moved, the guide is driven to approach the outlet end under the action of the plunger; the guide belt is restricted in the installation groove during the movement of the guide, avoiding the guide belt moving with the guide and being damaged under the friction between the guide and the oil cylinder body; the guide provides guidance for the plunger during movement, as the plunger is closely attached to the guide, and then the plunger is in contact with the guide belt, the side wall of the plunger can also restrict the guide belt in the installation groove, realizing the cooperation between the plunger, the guide and the oil cylinder body, after the plunger is installed in place, the oil cylinder body is pulled out through the pull rod, the method is simple.

[0015] Further, when the plunger pushes the guide, a second force is applied to the guide, the direction of the second force is opposite to the moving direction of the guide, and the second force is less than the force of the plunger pushing the guide to move.

[0016] The above method, by applying the second force, the guide and the plunger are closely attached, improving the guiding effect of the guide on the plunger, and at the same time, the second force is less than the force of the plunger pushing the guide to move, which does not interfere with the movement of the guide.

[0017] Further, the guiding tool device is realized, the guiding tool device includes a plunger, a cylinder body and a guide piece, the cylinder body is provided with an inlet end and an outlet end, the maximum width of the guide piece is the same as the maximum width of the plunger; a mounting groove is recessed on the inner wall of the cylinder body, a guide belt is arranged in the mounting groove, the guide piece is arranged in the guide belt and movably arranged in the cylinder body, one end of the guide piece is provided with a conical avoiding part, the distance between the conical avoiding part and the inner wall of the cylinder body is greater than the distance between the guide piece and the inner wall of the cylinder body, the guide piece limits the guide belt in the mounting groove during movement; the other end of the guide piece abuts against the plunger, the end of the guide piece close to the conical avoiding part is provided with a pull rod, the pull rod extends to the outside of the cylinder body through the outlet end.

[0018] The mounting groove is recessed and formed on the inner wall of the cylinder body, the mounting groove limits the guide belt in the axial and radial directions of the cylinder body, so that the guide belt does not separate from the mounting groove, the plunger is assembled in the cylinder body, and the cooperation between the plunger, the guide belt and the cylinder body is good; when the plunger is mounted, one end of the guide piece is first arranged in the cylinder body, then the plunger is abutted against the other end of the guide piece, the plunger is pushed to move the guide piece together to the outlet end of the cylinder body, and after the plunger is aligned with the guide piece, the guide piece is pulled out of the cylinder body through the pull rod.

[0019] The conical avoiding part avoids the guide belt, because the distance between the conical avoiding part and the inner wall of the cylinder body is greater than the distance between the guide piece and the inner wall of the cylinder body, when the conical avoiding part contacts the guide piece, the conical avoiding part generates an upward supporting force on the guide belt to press the guide belt in the mounting groove, so that when the end surface of the guide piece is parallel to the end surface of the guide belt, the guide piece only generates a pressure on the guide belt in the length direction of the cylinder body to push the guide belt to separate from the mounting groove; after the conical avoiding part continues to move to the outlet end and the conical avoiding part is misaligned with the guide belt, the guide piece limits the guide belt in the mounting groove, because the maximum width of the guide piece is the same as the maximum width of the plunger, and then the plunger can also limit the guide belt in the mounting groove during movement, and the plunger is guided during installation by the guide piece.

[0020] Further, the pull rod and the guide piece are detachably connected. Thus, it is convenient to use.

[0021] Further, the end of the guide piece close to the conical avoiding part is provided with a mounting hole, the mounting hole is a threaded hole; the end of the pull rod close to the mounting hole is provided with a threaded part, and the threaded part is threadedly connected with the mounting hole. The reliable connection between the threaded part and the mounting hole is realized through the threaded cooperation.

[0022] Further, the other end of the guide piece is provided with a recessed part, and one end of the plunger is provided with a protruding part, the protruding part extends into the guide piece and abuts against the recessed part.

[0023] The protrusion extends into the guide and cooperates with the recess, so that the plunger is tightly fitted with the guide.

[0024] Further, the recess is a ring-shaped recess, the protrusion is a ring-shaped protrusion, the width of the recess is greater than the width of the protrusion, and the outer wall of the protrusion abuts against the inner wall of the recess.

[0025] The recess limits the plunger in the radial direction of the guide, so that the plunger is aligned with the guide when the plunger is installed, and the plunger is aligned with the oil cylinder body through the alignment of the plunger and the guide. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A schematic view of the guide tool device for installing the guide.

[0027] Figure 2 For Figure 1 An enlarged view of a in the middle.

[0028] Figure 3 A schematic view of the guide tool device for installing the plunger.

[0029] Figure 4 A schematic view of the guide tool device after the plunger is installed in place.

[0030] Figure 5 A flowchart of the present application. DETAILED DESCRIPTION

[0031] The present application will be further described in detail below in combination with the drawings and specific embodiments.

[0032] As Figures 1-5 shown, a plunger installation method is achieved through a guide tool device, the guide tool device comprising a plunger 1, an oil cylinder body 2, and a guide 3, the oil cylinder body 2 being provided with an inlet end 21 and an outlet end 22, the maximum width of the guide 3 being the same as the maximum width of the plunger 1; two installation grooves (not shown in the figure) are recessed on the inner wall of the oil cylinder body 2, and a guide belt 4 is arranged in each installation groove, the installation grooves being recessed and formed on the inner wall of the oil cylinder body 2, the installation grooves limiting the guide belt 4 in the axial and radial directions of the oil cylinder body 2, so that the guide belt 4 does not come off the installation groove, and the plunger 1 is assembled in the oil cylinder body 2, the cooperation between the plunger 1, the guide belt 4, and the oil cylinder body 2 being good. In this embodiment, the guide belt 4 is a split guide belt, and the guide belt 4 has an opening.

[0033] The guide member 3 is inserted into the guide band 4 and is movable inside the cylinder body 2. One end of the guide member 3 is provided with a conical clearance part 31. The distance between the conical clearance part 31 and the inner wall of the cylinder body 2 is greater than the distance between the guide member 3 and the inner wall of the cylinder body 2. During the movement, the guide member 3 restricts the guide band 4 in the mounting groove. The plunger 1 abuts against the other end of the guide member 3. The end of the guide member 3 near the conical clearance part 31 is provided with a pull rod 5. The pull rod 5 passes through the outlet end 22 and extends to the outside of the cylinder body 2.

[0034] By setting a tapered clearance part 31 to avoid the guide band 4, since the distance between the tapered clearance part 31 and the inner wall of the cylinder body 2 is greater than the distance between the guide member 3 and the inner wall of the cylinder body 2, when the tapered clearance part 31 contacts the guide member 3, the tapered clearance part 31 generates an upward supporting force on the guide band 4, pressing the guide band 4 tightly in the mounting groove. (Refer to...) Figure 2 As shown, the conical clearance part 31 generates an upward supporting force F on the guide member 3, thus preventing the guide member 3 from being parallel to the end face of the guide belt 4. In this way, the guide member 3 only exerts pressure on the guide belt 4 along the length direction of the cylinder body 2 to push the guide belt 4 out of the mounting groove. When the conical clearance part 31 continues to move towards the outlet end 22, causing the conical clearance part 31 to be misaligned with the guide belt 4, the guide member 3 restricts the guide belt 4 in the mounting groove. Since the maximum width of the guide member is the same as the maximum width of the plunger 1, the plunger 1 can also restrict the guide belt 4 in the mounting groove when it moves. The guide member 3 guides the installation of the plunger 1.

[0035] The pull rod 5 is either fixedly connected to the guide member 3 or detachably connected. A fixed connection via the pull rod 5 ensures a reliable connection. A detachable connection via the pull rod 5 provides convenience.

[0036] In this embodiment, the pull rod 5 is detachably connected to the guide member 3; a mounting hole 32 is provided at one end of the guide member 3 near the tapered clearance portion 31, and the mounting hole 32 is a threaded hole; a threaded portion is provided at one end of the pull rod 5 near the mounting hole 32, and the threaded portion is threadedly connected to the mounting hole 32. A reliable connection between the threaded portion and the mounting hole 32 is achieved through the threaded engagement.

[0037] The other end of the guide 3 is provided with a recess 33, and one end of the plunger 1 is provided with a protrusion which extends into the guide 3 and abuts against the recess 33. The protrusion extends into the guide 3 and cooperates with the recess 33, so that the plunger 1 and the guide 3 are tightly fitted. The recess 33 is an annular recess 33, and the protrusion is an annular protrusion 11. The width of the recess 33 is greater than the width of the protrusion 11, and the outer wall of the protrusion 11 abuts against the inner wall of the recess 33. The recess 33 limits the plunger 1 in the radial direction of the guide 3, so that the plunger 1 and the guide 3 are aligned when the plunger 1 is installed, and the plunger 1 and the oil cylinder body 2 are aligned through the alignment of the plunger 1 and the guide 3.

[0038] The method for installing the plunger comprises the following steps:

[0039] S1, installing a guide belt with an opening in each of the two or more installation grooves of the oil cylinder body, and the openings of the two or more guide belts are arranged in a staggered manner.

[0040] S2, extending the conical avoiding portion of the guide into the inlet end of the oil cylinder body.

[0041] S3, abutting one end of the plunger against the end of the guide away from the conical avoiding portion.

[0042] S4, moving the plunger to move the guide towards the outlet end of the oil cylinder body.

[0043] S5, when the guide contacts the guide belt, the conical avoiding portion of the guide generates an upward supporting force on the guide belt to press the guide belt tightly in the installation groove.

[0044] S6, continuing to move the plunger, after the conical avoiding portion is staggered with the guide belt, the guide limits the guide belt in the installation groove.

[0045] S7, continuing to move the plunger, after the plunger is aligned with the guide, the guide is pulled out of the oil cylinder body through the pull rod.

[0046] The above method, by installing the guide belt with openings, is simple to install, while avoiding the interference of the guide belt with the plunger activity; meanwhile, the openings of the guide belt are staggered, and the openings of adjacent guide belts are not on the same straight line, so that the plunger can contact the oil cylinder body through the guide at different positions along the circumferential direction of the plunger, reducing the wear between the plunger and the oil cylinder body. The width of the conical avoiding part is smaller than the width of the guide, the conical avoiding part of the guide is first inserted into the inlet end, which facilitates the cooperation of the guide and the oil cylinder body, then the plunger is attached to the guide and the plunger is moved, the guide is driven to approach the outlet end under the action of the plunger; the guide belt is limited in the installation groove when the guide moves, avoiding the guide belt moving with the guide and being damaged under the friction of the guide and the oil cylinder body; the guide provides guidance for the plunger when it moves, and since the plunger is closely attached to the guide, the side wall of the plunger can also limit the guide belt in the installation groove when the plunger contacts the guide belt, realizing the cooperation between the plunger, the guide and the oil cylinder body; after the plunger is installed in place, the oil cylinder body is pulled out through the pull rod, which is simple.

[0047] In the above method, the plunger pushes the guide when the guide is subjected to a second force, the direction of the second force is opposite to the moving direction of the guide, and the second force is smaller than the force of the plunger pushing the guide to move. By applying the second force, the guide and the plunger are closely attached, improving the guiding effect of the guide on the plunger, and the second force is smaller than the force of the plunger pushing the guide to move, so it will not interfere with the movement of the guide.

Claims

1. A method of installing a plunger, characterized by: The application relates to a guiding tool device for realizing the installation of a plunger, which comprises a plunger, a cylinder body and a guide piece, the cylinder body is provided with an inlet end and an outlet end, the maximum width of the guide piece is the same as that of the plunger; a mounting groove is recessed in the inner wall of the cylinder body, a guide belt is arranged in the mounting groove, the guide piece is arranged movably in the guide belt and in the cylinder body, one end of the guide piece is provided with a conical avoiding part, the distance between the conical avoiding part and the inner wall of the cylinder body is larger than the distance between the guide piece and the inner wall of the cylinder body, and the guide belt is limited in the mounting groove during the movement of the guide piece; the other end of the guide piece is in abutment with the plunger, the end of the guide piece close to the conical avoiding part is provided with a pull rod, the pull rod extends to the outside of the cylinder body through the outlet end, and the installation method of the plunger comprises the following steps: S1, installing guide belts with openings in two or more mounting grooves of the cylinder body, respectively, and the openings of the two or more guide belts are arranged in a staggered mode; S2, extending the conical avoiding part of the guide piece into the inlet end of the cylinder body; S3, abutting one end of the plunger with the end of the guide piece away from the conical avoiding part; S4, moving the plunger, and moving the guide piece to the outlet end of the cylinder body by the plunger; S5, when the guide piece is in contact with the guide belt, the conical avoiding part of the guide piece generates an upward supporting force on the guide belt to press the guide belt in the mounting groove; S6, continuing to move the plunger, after the conical avoiding part is staggered with the guide belt, the guide piece limits the guide belt in the mounting groove; S7, continuing to move the plunger, and after the plunger is aligned with the guide piece, the guide piece is pulled out of the cylinder body through the pull rod.

2. A method of mounting a plunger as claimed in claim 1, characterised in that: When the plunger moves the guide piece, a second action force is applied to the guide piece, the direction of the second action force is opposite to the moving direction of the guide piece, and the second action force is smaller than the force with which the plunger moves the guide piece.

3. A method of mounting a plunger as defined in claim 1, characterized in that: The pull rod is detachably connected with the guide piece.

4. A method of mounting a plunger as claimed in claim 3, wherein: A mounting hole is arranged at the end of the guide piece close to the conical avoiding part, the mounting hole is a threaded hole; a threaded part is arranged at the end of the pull rod close to the mounting hole, and the threaded part is threadedly connected with the mounting hole.

5. The method of mounting a plunger of claim 1, wherein: The other end of the guide piece is provided with a recessed part, and one end of the plunger is provided with a protruding part, the protruding part extends into the guide piece and is in abutment with the recessed part.

6. A method of mounting a plunger as claimed in claim 5, characterised in that: The recessed part is an annular recessed part, the protruding part is an annular protruding part, the width of the recessed part is larger than that of the protruding part, and the outer wall of the protruding part is in abutment with the inner wall of the recessed part.

Images