CN112847243A

CN112847243A - Dismounting device of annular work piece

Info

Publication number: CN112847243A
Application number: CN201911191934.7A
Authority: CN
Inventors: 汪军; 毕合春; 杨波
Original assignee: Beijing Foton Cummins Engine Co Ltd
Current assignee: Beijing Foton Cummins Engine Co Ltd
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2021-05-28

Abstract

The application provides a dismounting device for an annular workpiece, which comprises a screw rod; and a detachment assembly comprising: an engagement portion for screw-threaded engagement with the screw; an expansion portion provided with a boss portion near a free end thereof, the boss portion extending radially outward for engaging the annular workpiece; and a through hole extending through the engagement portion and the expanded portion, the through hole including a tapered section within the expanded portion; wherein the threaded rod is threaded into the through hole and the first end of the threaded rod is capable of extending into the tapered section to expand the expanded portion such that the boss engages the annular workpiece. By using the dismounting device, the bulge part can be jointed with the annular bulge through the expansion of the expansion part, so that the dismounting tool can be jointed with the annular workpiece, and the annular workpiece can be dismounted from the mounting hole under the action of external force.

Description

Dismounting device of annular work piece

Technical Field

The invention relates to the technical field of mechanical equipment parts, in particular to a dismounting device for an annular workpiece.

Background

The valve seat ring of automobile engine is an important part of engine, and is a portal for air intake and exhaust after combustion when the fuel of internal combustion engine is combusted, and its main purpose is to ensure the sealing of combustion chamber. Because the severe working conditions need to bear the impact and abrasion of the valve, the erosion and oxidation of the air inlet and exhaust flows and the like in a high-temperature environment, the high-temperature resistant, wear resistant and oxidation resistant properties of the valve seat ring are extremely high.

Usually, be interference fit between the valve seat circle hole on valve seat circle and the engine cylinder lid, when needs rework and maintenance valve seat circle, the technical staff need spend very big energy to accomplish and dismantle: on one hand, if the valve seat ring is not pressed in place or other quality problems occur after the valve seat ring is pressed, the valve seat ring cannot be detached, and the whole cylinder cover is scrapped; on the other hand, if the valve seat ring is detached violently, important processing surfaces such as the valve seat ring and a valve seat ring hole in the cylinder cover can be damaged, and the cylinder cover is scrapped.

Therefore, it is necessary to develop a novel valve seat insert removing device which can extract the valve seat insert from the valve seat insert hole of the cylinder cover without damaging the valve seat insert and the cylinder cover.

Disclosure of Invention

To the problem among the above-mentioned prior art, this application has provided a dismounting device of annular workpiece, utilizes the elastic force to fix the device in valve seat circle bottom, extracts the valve seat circle with the impact force, can not cause the damage to valve seat circle and cylinder cap in the whole operation process.

The invention provides a dismounting device of an annular workpiece, which comprises a screw rod; and a detachment assembly comprising: an engagement portion for screw-threaded engagement with the screw; an expansion portion provided with a boss portion near a free end thereof, the boss portion extending radially outward for engaging the annular workpiece; and a through hole extending through the engagement portion and the expanded portion, the through hole including a tapered section within the expanded portion; wherein the threaded rod is threaded into the through hole and the first end of the threaded rod is capable of extending into the tapered section to expand the expanded portion such that the boss engages the annular workpiece. By using the dismounting device, the bulge part can be jointed with the annular bulge through the expansion of the expansion part, so that the dismounting tool can be jointed with the annular workpiece, and the annular workpiece can be dismounted from the mounting hole under the action of external force.

In one embodiment, the tapered section is conical in cross-sectional shape. With this embodiment, it is possible to make the expanded portion uniformly expanded in the circumferential direction when the end portion of the screw rod protrudes into the tapered section, thereby ensuring uniform engagement of the projection portion with the annular workpiece.

In one embodiment, the tapered section of the cone has a cone angle of 28 °.

In one embodiment, the expansion portion includes a plurality of expansion pieces extending in the axial direction, the plurality of expansion pieces being fixedly connected with the joint portion with a space provided between adjacent expansion pieces. Through this embodiment, can reduce the resistance that this inflation portion outwards expands, reduce operating personnel's the operation degree of difficulty.

In one embodiment, the first end of the screw is of a frustoconical configuration. Through this embodiment, can play the guide effect, the operating personnel of being convenient for inserts the screw rod in the through-hole of dismantling the subassembly.

In one embodiment, the screw comprises a screw body and an extending piece, wherein the screw body and the extending piece are detachably connected, one end of the extending piece is connected with the screw body, and the other end of the extending piece extends into the through hole. Through the embodiment, only the extending piece can be replaced when the tip of the screw (extending piece) is damaged, the whole screw does not need to be replaced, and the cost is reduced.

In one embodiment, the free end of the expansion is provided with a chamfered structure. Through this embodiment, this chamfer structure can play fine guide effect, and the operating personnel of being convenient for inserts this dismounting device in the mounting hole, and this chamfer structure has avoided the harm to cyclic annular work piece simultaneously.

In one embodiment, the detachment device further includes a grip assembly fixedly disposed at the second end of the threaded rod. Through this embodiment, can be convenient for operating personnel to grasp this gripping subassembly rotating screw for during the tip of screw rod stretched into the dismantlement subassembly, reduce operating personnel's the operation degree of difficulty.

In one embodiment, the gripping assembly includes a nut and a pull rod, wherein the nut is threadedly coupled to the second end of the threaded rod, and the nut passes through the nut in a radial direction and is fixedly coupled to the nut.

In one embodiment, the detaching device further includes a moving slider that is sleeved on the screw rod and is capable of sliding along the axial direction of the screw rod. With this embodiment, the operator can grasp the moving slide and strike the gripping assembly at the end of the screw in such a way as to detach the annular workpiece from the mounting hole.

In one embodiment, the projection includes a plurality of projections distributed along a circumferential direction of the expansion portion.

In one embodiment, the bulge is a convex ring along a circumferential direction of the bulge.

In one embodiment, a steel ball is fixedly arranged on the top surface of the circular truncated cone structure, and the diameter of the steel ball is larger than that of the top surface of the circular truncated cone and smaller than the inner diameter of the through hole. With this embodiment, the expansion width of the expansion portion can be increased, and also the operator can fixedly engage the boss portion with the annular workpiece with only a small force.

The application provides a dismounting device of cyclic annular work piece compares in prior art, has following beneficial effect:

(1) the removal device is fixedly engaged with the annular workpiece by utilizing expansion of the expansion portion so that the annular workpiece can be removed from the mounting hole without damaging the annular workpiece;

(2) by arranging the movable sliding block, an operator can detach the annular workpiece in such a way by circularly sliding the movable sliding block to impact the gripping assembly at the top of the screw rod, so that the situation that the operator spends great force on detaching is avoided;

(3) the expansion part comprises a plurality of expansion sheets which are mutually spaced, so that the difficulty of the expansion part expanded by the screw rod is reduced;

(4) the steel ball is arranged at the end part of the circular truncated cone shape of the screw rod, so that the expansion amplitude of the expansion part can be increased, and an operator can fixedly joint the bulge part and the annular workpiece only by using small force;

(5) the tool has a simple structure, is convenient to use, and can smoothly complete work by only one person;

(6) the working beat of pulling out the single valve seat ring is within 2 minutes, and the efficiency is very high.

The features mentioned above can be combined in various suitable ways or replaced by equivalent features as long as the object of the invention is achieved.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:

FIG. 1 is a schematic view showing an assembly structure of a valve seat ring and a valve mounting hole;

FIG. 2 is a schematic structural view showing a dismounting device for a ring-shaped workpiece according to an embodiment of the present invention;

FIG. 3 shows a schematic structural view of a screw of the dismounting device according to an embodiment of the present invention;

FIG. 4 shows a schematic structural view of a detachment assembly of the detachment apparatus according to an embodiment of the present invention;

FIG. 5 is a view showing an operation of the removing apparatus according to the embodiment of the present invention when it is inserted into the valve seat hole to remove the valve seat.

List of reference numerals:

1-valve seat ring; 2-valve seat ring hole; 100-a dismounting device; 110-screw; 111-screw body; 112-an extender; 120-disassembling the assembly; 121-a joint; 122-an expansion portion; 122A-an intumescent sheet; 123-through holes; 123A-a tapered section; 124-a boss; 130-a grip assembly; 131-a nut; 132-a pull rod; 140-moving the slider.

In the drawings, like parts are provided with like reference numerals. The drawings are not to scale.

Detailed Description

The invention will be further explained with reference to the drawings.

The annular workpiece dismounting device provided by the application can be used for dismounting the annular workpiece in interference fit with the mounting hole, and for the purpose of description, the situation that the valve seat ring is pressed and mounted in the valve seat ring mounting hole of the cylinder cover in the field of engines is taken as an example in the middle of the text.

Fig. 1 is a sectional view showing a structure in which a valve seat 1 is press-fitted into a valve seat hole 2 by interference fit in the prior art. As shown in fig. 1, the top inner wall of the valve seat insert 1 is chamfered, and a gap exists between the valve seat insert 1 and the valve seat insert hole 2.

Due to the interference fit, the valve seat ring 1 is difficult to be detached from the valve seat ring hole 2, and the detaching tool 100 for the annular workpiece provided by the present application can easily solve the above problems. Fig. 2 is a schematic structural diagram of the detaching tool 100 of the present invention.

As shown in fig. 2, the detaching device 100 includes a screw 110 and a detaching assembly 120, and the detaching assembly 120 includes an engaging portion 121, an expanding portion 122, and a through hole 123. It should be understood that the take-down assembly 120 should be of cylindrical construction to accommodate the requirements of the annular workpiece. The joint part 121 and the expansion part 122 form a main body of the detaching assembly 120, the joint part 121 and the expansion part 122 are cylindrical structures, and the through hole 123 penetrates through the main body part; during use of the removal device 100, the first end of the screw 110 may be inserted into the through hole 123, and the screw 110 reaches the expansion portion 122 to expand the expansion portion, thereby engaging the valve seat ring with the removal tool 100.

Optionally, the diameter of the engaging portion 121 is smaller than the diameter of the expansion portion 122.

In one embodiment of the present application, as shown in fig. 2 and 4, in the structure of the detachment assembly 120, one end of the expansion portion 122 is connected to the engagement portion 121, and the other end is adapted to protrude into the valve seat hole 2. Preferably, the expansion part 122 and the engagement part 121 are integrally formed, so that the overall strength of the disassembly assembly can be increased, and the disassembly assembly can be prevented from sliding relatively during the rotation of the screw rod.

The screw 110 is provided with an external thread and the engagement portion 121 is at least partially internally threaded to threadedly engage the screw 110. The threaded rod 110 first passes through this joint 121, and when the externally threaded section of the conductive threaded rod 110 is threadably engaged, the threaded rod 110 is rotated into the joint 121 so that the leading end of the threaded rod 110 can continue to advance into the expansion 122. Here, the expansion part 122 may be made of a steel material having a certain elastic deformability, for example, T8 steel, so that the expansion part 122 can expand outward when receiving a pressing force from the inner through hole.

As shown in fig. 4, the through hole 123 of the detachment assembly 120 penetrates the joint 121 and the expansion 122, and includes a tapered section 123A at a section of the expansion 122, the tapered section 123A indicating that an inner diameter of the through hole is gradually reduced in a direction from the joint 121 to the expansion 122. Wherein, in one embodiment, the tapered section 123A is located near the end of the expansion 122, i.e., the through-hole includes a straight hole section having a diameter slightly larger than that of the first end (end portion extending into the through-hole) of the screw bar 110 and a tapered section 123A inside the expansion portion 122, so that the screw rod 110 can smoothly travel in the straight hole section, and after the first end of the screw rod 110 travels to the tapered section 123A, the travel of the first end is hindered due to the reduction in diameter of the through-hole 110, the forward travel of the first end causes it to gradually press the inner wall of the tapered section 123A, and since the expansion portion 122 has an elastic deformation property, the expansion portion 122 gradually expands outward, and a projection 124 (shown in fig. 2 and 4) provided on an outer wall of a free end of the expansion portion 122 in the circumferential direction moves outward in the radial direction along with it, being inserted into a gap between the valve seat ring 1 and the valve seat hole 2. In another embodiment, the section of the through hole 123 located in the entire bulge 122 is a tapered section 123A, i.e., does not include a straight hole section, the first end of the screw 110 directly enters the tapered section 123A via the joint 121, and the tapered section 123A is pressed to insert the boss 124 into the gap between the valve seat ring 1 and the valve seat ring hole 2.

Preferably, the tapered section 123A is conical in cross-sectional shape. In this way, the extrusion generated by the first end of the screw 110 can be uniformly dispersed on the convex portion 124 on the periphery of the expansion portion 122, and the convex portion 124 is uniformly inserted into the gap, which is beneficial to the subsequent extraction of the operator. More preferably, the conical angle of the conically tapered section 123A is 28 °.

Preferably, the expansion part 122 includes a plurality of expansion pieces 122A extending along the axial direction, the expansion pieces 122A are fixedly connected (preferably integrally formed) with the joint part 121, and a space is provided between adjacent expansion pieces 122A, so that by dividing the expansion part 122 into a plurality of expansion pieces 122A, the expansion of the expansion part 122 can be more easily performed, so that the operator can generate the desired expansion of the expansion part 122 with less effort, and the operation difficulty is reduced. More preferably, the plurality of expansion pieces 122A are equally spaced.

In a preferred embodiment, the free end of the bulge 122 is provided with a chamfer, by which embodiment the chamfer structure can provide a good guiding function for the operator to insert the dismounting device into the mounting hole, while the chamfer structure avoids damage to the valve seat insert 1.

In manufacturing the detachment assembly 120, the protrusion 124 is usually locally heat treated to have a quenched hardness of HRC50, so as to ensure the strength of the protrusion 124 and prevent the risk of fracture during the subsequent extraction process.

Optionally, the bulge 124 comprises a plurality of protrusions distributed along the circumference of the bulge.

Alternatively, the convex portion 124 is a convex ring along the circumferential direction of the expansion portion.

Preferably, in the manufacturing process of the detachment assembly 120 provided by the present invention, a groove is formed in the position of the expansion portion 122 near the free end along the circumferential direction, and the protrusion 124 is an edge portion of the expansion portion 122 near the groove, as shown in fig. 4.

Fig. 3 is a schematic structural view of the screw 110. The screw 110 is an elongated rod structure, and a first end thereof is used to extend into the through hole 123 of the detaching assembly 120 and press the tapered section 123A. An external thread is provided on the screw 110 near the first end to threadedly mate with an internal thread provided in the engagement portion 121 of the detachment assembly 120, by which the screw 110 is rotatable into the through-hole 123. It will be appreciated that the external thread of the screw 110 should be positioned in such a position that after the protrusion 124 is inserted into the gap between the valve seat insert 1 and the valve seat insert hole 2, the external thread of the screw 110 and the internal thread of the engagement portion 121 are still in a fitted state, and function to maintain the relative positions of the screw 110 and the removal assembly 120, facilitating the subsequent extraction operation by the operator.

Preferably, as shown in fig. 3, the first end of the screw rod 110 is a circular truncated cone structure, and by this embodiment, a guiding function can be performed, so that an operator can insert the screw rod into the through hole of the disassembling assembly conveniently.

Preferably, a steel ball is fixed (e.g., welded) on the top end surface of the circular truncated cone structure, and the diameter of the steel ball is larger than that of the top surface of the circular truncated cone and smaller than the inner diameter of the through hole. With this embodiment, the expansion width of the expansion portion can be increased, and also the operator can fixedly engage the boss portion with the annular workpiece with only a small force.

Preferably, the screw 110 may include a screw body 111 and an introduction member 112 detachably coupled. The screw body 111 and the insertion member 112 may be connected to each other in various ways. Alternatively, the two are threaded, one end of the screw body 111 is provided with an internal thread and one end of the protruding member 112 is provided with an external thread, it being understood that in this case, the diameter of the protruding member 112 is smaller than the diameter of the screw body 111 (as shown in fig. 3); optionally, the two are connected by a snap fit. This allows the first end of the screw 110 to be easily replaced, for example, in the event of wear over extended use, without replacing the entire screw 110, by replacing the protruding member 112.

In one embodiment, the detachment apparatus 100 further includes a grip assembly 130 disposed at the second end of the screw 110, and an operator may grip the grip assembly 130 to rotate the screw 110 to travel within the through-hole 123 of the detachment assembly 120. Preferably, as shown in fig. 2, the gripping assembly 130 includes a nut 131 and a pull rod 132, the nut 131 is connected to the second end of the screw 110, and a hole is opened in the nut 131 along a radial direction, and the pull rod 132 passes through the hole and is fixedly connected to the nut 131. Alternatively, the nut 131 may be fixedly coupled or removably coupled (e.g., threadably coupled, as shown in FIG. 3) to the second end of the nut 110.

Further, as shown in fig. 2, the dismounting device 100 further includes a moving slider 140, the moving slider 140 is sleeved on the screw 110 and can slide on the screw 110 along the axial direction of the screw 110 to hit the nut 131 of the gripping assembly 130, and the valve seat 1 is pulled out from the valve seat hole 2 by continuous impact, so that the operator does not need to pull out with great labor, and the labor cost is saved.

Preferably, the outer wall of the moving slider 140 includes a plurality of concave structures along the circumferential direction, which facilitates the grasping operation of the operator from the viewpoint of ergonomics, so that the moving slider 140 can be grasped; more preferably, a groove is further included between the plurality of concave structures, which further increases the friction between the hand of the operator and the moving slider 140, and facilitates the force generation of the operator.

Fig. 5 is a schematic view of the detachment assembly 100 provided in the present application in operation.

In the idle state, the screw 110 passes through the joint 121 of the detaching assembly 120, and the first end of the screw 110 reaches the through hole area close to the tapered section 123A, the tapered section 123A is not pressed by the first end, so that the expansion part 122 is not expanded, and the screw 110 and the joint 121 are in threaded connection to maintain the relative position of the screw 110 and the detaching assembly 120. During use, an operator extends the dismounting device 100 into the valve mounting hole 2 and positions the dismounting device close to the bottom end face of the valve seat ring 1, the screw 110 is rotated by holding the gripping assembly 130, the first end of the screw 110 enters the tapered section 123A and presses the tapered section, so that the part of the expansion part 120 located in the tapered section 123A expands, the bulge part 124 follows the expansion part to move outwards along the radial direction and is inserted into the gap between the valve seat ring 1 and the valve seat ring hole 2, and the screw 110 is continuously rotated until the screw cannot rotate; the operator grasps the moving slider 140 to strike the nut 131, and pulls out the valve retainer 1 from the valve retainer hole 2 by continuous impact force.

The application provides a dismounting device of an annular workpiece, which is fixedly connected with the annular workpiece by utilizing the expansion of an expansion part, so that the annular workpiece can be dismounted from a mounting hole without damaging the annular workpiece; by arranging the movable sliding block, an operator can detach the annular workpiece in such a way by circularly sliding the movable sliding block to impact the gripping assembly at the top of the screw rod, so that the situation that the operator spends great force on detaching is avoided; the expansion part comprises a plurality of expansion sheets which are mutually spaced, so that the difficulty of the expansion part expanded by the screw rod is reduced; the steel ball is arranged at the end part of the circular truncated cone shape of the screw rod, so that the expansion amplitude of the expansion part can be increased, and an operator can fixedly joint the bulge part and the annular workpiece only by using small force.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "rear", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the present invention.

Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that features described in different dependent claims and herein may be combined in ways different from those described in the original claims. It is also to be understood that features described in connection with individual embodiments may be used in other described embodiments.

Claims

1. A device for disassembling an annular workpiece, comprising:

a screw; and

a detachment assembly comprising:

an engagement portion for screw-threaded engagement with the screw;

an expansion portion provided with a boss portion near a free end thereof, the boss portion extending radially outward for engaging the annular workpiece; and

a through hole extending through the engagement portion and the expanded portion, the through hole including a tapered section within the expanded portion;

wherein the threaded rod is threaded into the through hole and the first end of the threaded rod is capable of extending into the tapered section to expand the expanded portion such that the boss engages the annular workpiece.

2. The detachment apparatus of claim 1, wherein the tapered section is conical in cross-sectional shape.

3. The detachment device according to claim 2, wherein the expansion portion includes a plurality of expansion pieces extending in the axial direction, the plurality of expansion pieces being fixedly connected with the engagement portion with a space provided between adjacent expansion pieces.

4. The disassembly apparatus of claim 1, wherein the first end of the threaded rod is frustoconical.

5. The dismounting device according to claim 4, characterized in that a steel ball is fixedly arranged on the top surface of the circular truncated cone structure, and the diameter of the steel ball is larger than that of the top surface of the circular truncated cone and smaller than the inner diameter of the through hole.

6. The detachment apparatus of any of claims 1 to 5, further comprising a grip assembly fixedly disposed at the second end of the threaded rod.

7. The detachment apparatus of claim 6, wherein the grip assembly includes a nut and a pull rod, wherein the nut is threadedly coupled to the second end of the threaded rod, and the nut passes through and is fixedly coupled to the nut in a radial direction.

8. The dismounting device according to any one of claims 1 to 5, further comprising a moving slider that is fitted over the screw rod and is slidable along an axial direction of the screw rod.

9. The detachment device according to any one of claims 1 to 5, characterized in that the projection includes a plurality of projections distributed along a circumferential direction of the expansion portion.

10. The dismounting device according to any one of claims 1 to 5, characterized in that the projection is a convex ring in the circumferential direction of the expansion.

11. The dismounting device according to any one of claims 1 to 5, wherein the screw comprises a screw body and an extending piece, the screw body and the extending piece are detachably connected, one end of the extending piece is connected with the screw body, and the other end of the extending piece extends into the through hole.

12. A dismounting device according to any one of claims 2-5, characterized in that the taper angle of the tapered section of the taper is 28 °.

13. A dismounting device according to any one of claims 1-5, characterised in that the free end of the expansion is provided with a chamfered structure.