CN109162989B

CN109162989B - Return buffer device

Info

Publication number: CN109162989B
Application number: CN201811159588.XA
Authority: CN
Inventors: 李祖荟; 罗敏; 孟华; 张军福; 高卓
Original assignee: Wuhan Marine Machinery Plant Co Ltd
Current assignee: Wuhan Marine Machinery Plant Co Ltd
Priority date: 2018-09-30
Filing date: 2018-09-30
Publication date: 2020-10-16
Anticipated expiration: 2038-09-30
Also published as: CN109162989A

Abstract

The invention discloses a return stroke buffering device, and belongs to the technical field of hydraulic control. This return stroke buffer includes: buffer cylinder, buffering end cover and buffer piston, the one end of buffer cylinder is equipped with the buffering end cover, the buffer piston cartridge is in the buffer cylinder, the outer wall of buffer piston with the inner wall sliding fit of buffer cylinder, be equipped with at least one earial drainage hole on the lateral wall of buffer cylinder, the aperture of earial drainage hole is from being located the one end of the inner wall of buffer cylinder arrives the one end of the outer wall of buffer cylinder reduces gradually. The invention can avoid the piston from being damaged by slag and gravel.

Description

Return buffer device

Technical Field

The invention relates to the technical field of hydraulic control, in particular to a return stroke buffering device.

Background

The return buffer device is an important component in the piston reciprocating mechanism. The hydraulic brake is generally used for performing hydraulic braking on a piston in a piston reciprocating mechanism, buffering power during return stroke of the piston is relieved, and the piston is prevented from being impacted.

The current return stroke buffer device comprises a buffer cylinder and a piston, wherein one end of the buffer cylinder is provided with an end cover, the end cover is provided with a discharge hole, and the piston is inserted into the buffer cylinder from the other end of the buffer cylinder. The existing return stroke buffering device utilizes fluid which is not drained from a drain hole in a buffering cylinder to buffer the impact force of the piston during return stroke, so that the piston is protected.

In the process of implementing the invention, the inventor finds that the prior art has at least the following problems:

because the piston is inevitable can send the collision with buffer cylinder and end cover in reciprocating motion process, lead to producing the disintegrating slag of piston, buffer cylinder or end cover in the buffer cylinder, there is grit simultaneously also in the aquatic to this disintegrating slag and grit are difficult to discharge through the discharge orifice that sets up on the end cover. And once the crushed slag and the sand are excessively accumulated, the piston can be damaged in the moving process.

Disclosure of Invention

The embodiment of the invention provides a return stroke buffering device which can prevent a piston from being damaged by broken slag and gravel. The technical scheme is as follows:

an embodiment of the present invention provides a backhaul buffer device, where the backhaul buffer device includes: buffer cylinder, buffering end cover and buffer piston, the one end of buffer cylinder is equipped with the buffering end cover, the buffer piston cartridge is in the buffer cylinder, the outer wall of buffer piston with the inner wall sliding fit of buffer cylinder, be equipped with at least one discharge orifice on the lateral wall of buffer cylinder, the aperture of discharge orifice is from being located the one end of the inner wall of buffer cylinder arrives the one end of the outer wall of buffer cylinder reduces gradually.

In an implementation manner of the embodiment of the present invention, the return stroke buffering device further includes a first permanent magnet, the first permanent magnet is located at one side of the buffering cylinder close to the buffering end cover, and the buffering piston is a metal structural member.

In another implementation manner of the embodiment of the present invention, a second permanent magnet is disposed on an end surface of one end of the buffer piston facing the first permanent magnet.

In another implementation manner of the embodiment of the present invention, the return stroke buffering device further includes an insulating bushing, and the insulating bushing is inserted into the buffer cylinder and located between the buffer cylinder and the buffer piston.

In another implementation manner of the embodiment of the present invention, an inner flange is provided on an inner wall of the insulating bush, the first permanent magnet has a fixing portion and a locking portion that are coaxially connected, the fixing portion is located between the buffer end cover and the inner flange, and the inner flange is located between the buffer cylinder and the locking portion.

In another implementation of the embodiment of the invention, the damping piston has a piston column, the diameter of the piston column is not smaller than the inner diameter of the inner flange, and the axial length of the locking part is not greater than the axial length of the inner flange.

In another implementation manner of the embodiment of the present invention, a tapered surface is disposed on an inner wall of the insulating bushing, an outer wall of the piston column is in sliding fit with the tapered surface, and an inner diameter of the tapered surface is gradually reduced from one end far away from the inner flange to one end close to the inner flange.

In another implementation manner of the embodiment of the present invention, an annular protrusion is disposed on a piston rod of the buffer piston, an outer diameter of the annular protrusion is not smaller than an outer diameter of the buffer cylinder, and both an end surface of one end of the buffer cylinder, which is far away from the buffer end cover, and an end surface of the annular protrusion, which faces the buffer cylinder, are provided with an annular cushion pad.

In another implementation of the embodiment of the invention, the annular cushion is detachably connected to the annular protrusion and the cushion cylinder.

In another implementation manner of the embodiment of the invention, rubber blocks are arranged on the annular buffer cushion and the buffer end cover.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

according to the embodiment of the invention, the drain hole is arranged on the buffer cylinder, and the aperture of the drain hole is limited to be gradually reduced from one end of the inner wall of the buffer cylinder to one end of the outer wall of the buffer cylinder. Therefore, the broken slag generated in the reciprocating motion process of the buffer piston enters the drainage hole, and the broken slag cannot be attached to the inner wall of the buffer cylinder and rub against the buffer piston in the motion process to damage the buffer piston. Meanwhile, in the embodiment of the invention, the drainage hole is arranged on the inner wall of the buffer cylinder, and the slag is generated in the motion process of the buffer piston when the slag is normal, so that the drainage hole is arranged on the inner wall of the buffer cylinder, which is more beneficial to enabling the slag generated in the motion process of the buffer piston to quickly enter the drainage hole, and preventing the damage to the buffer piston caused by the fact that the slag cannot be quickly cleaned.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a backhaul buffering apparatus according to an embodiment of the present invention;

fig. 2 is a side view of a return stroke buffering device according to an embodiment of the present invention;

FIG. 3 is a schematic view of a drain hole according to an embodiment of the present invention.

The symbols in the drawings represent the following meanings:

1-a buffer cylinder, 10-a discharge hole, 2-a buffer end cover, 3-a buffer piston, 30-a second permanent magnet, 31-a piston column, 32-an annular bulge, 4-a first permanent magnet, 41-a fixed part, 42-a locking part, 5-an insulating bush, 51-an inner flange, 6-an annular buffer cushion, 7-an adjusting shim plate and 8-a rubber block.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a backhaul buffering apparatus according to an embodiment of the present invention. As shown in fig. 1, the backhaul buffering device includes: buffer cylinder 1, buffering end cover 2 and buffering piston 3, the one end of buffer cylinder 1 is equipped with

buffering end cover

2, and 3 cartridge of buffering piston are in buffer cylinder 1, and the outer wall of buffering piston 3 and the inner wall sliding fit of buffer cylinder 1 are equipped with at least one discharge orifice 10 on the lateral wall of buffer cylinder 1, and the aperture of discharge orifice 10 reduces from the one end that is located the inner wall of buffer cylinder 1 to the one end of the outer wall of buffer cylinder 1 gradually.

Fig. 2 is a side view of a return stroke buffering device according to an embodiment of the present invention. As shown in fig. 2, the inner wall of drain hole 10 transitions smoothly. The smooth transition of the inner wall of the drain hole 10 can facilitate the fluid to be smoothly discharged from the buffer cylinder 1, so that the water flow in the buffer cylinder 1 is smooth.

In an embodiment of the present invention, the gradually decreasing diameter of drain hole 10 may be tapered (as shown in FIG. 2). The conical discharge hole 10 meets the requirements of gradual change of the hole diameter and smooth transition, and can well load the slag.

In other embodiments of the present invention, drain hole 10 with a gradually decreasing aperture may also have a circular arc shape (as shown in fig. 3). The arc-shaped drain hole 10 has a larger accommodating space than the tapered drain hole 10, so that more slag can be loaded, and the use is convenient.

As shown in fig. 1, the return stroke buffering device further includes a first permanent magnet 4, the first permanent magnet 4 is located at one side of the buffering cylinder 1 close to the buffering end cover 2, and the buffering piston 3 is a metal structural member. The first permanent magnet 4 is arranged in the buffer cylinder 1, and the buffer piston 3 of a metal structural member is used, so that the first permanent magnet 4 generates attraction force on the buffer piston 3. In the return stroke process of the buffer piston 3, if the buffer piston 3 still cannot return to the initial position after being unpowered, the buffer piston 3 moves towards the buffer end cover 2 by the attraction force of the first permanent magnet 4 and stops at the initial position of the buffer piston 3. In the embodiment of the invention, the position where the first permanent magnet 4 abuts against the buffer piston 3 is the initial position of the buffer piston 3, so that other limiting devices are not required to be arranged to assist in positioning the buffer piston 3, and the return stroke buffer device is lighter.

Optionally, a second permanent magnet 30 is provided on an end surface of the damping piston 3 facing the end of the first permanent magnet 4. The second permanent magnet 30 is provided on the damping piston 3 so that the mutual attraction force of the damping piston 3 and the first permanent magnet 4 is stronger. The damping piston 3 can thus be moved rapidly toward the damping end cap 2 and returned to the initial position by the attractive forces of the first permanent magnet 4 and the second permanent magnet 30. The reliability of the first permanent magnet 4 is improved.

As shown in fig. 1, the return buffer device further includes an insulating bushing 5, and the insulating bushing 5 is inserted into the buffer cylinder 1 and located between the buffer cylinder 1 and the buffer piston 3. Can completely cut off buffer cylinder 1 and buffer piston 3 through setting up insulating bush 5, direct contact between buffer cylinder 1 and the first permanent magnet 4 avoids forming electrochemical corrosion, improves return stroke buffer's security.

The insulating bush 5 may be made of epoxy resin or the like. The epoxy resin has the characteristics of good corrosion resistance, water resistance, good leakage resistance and high strength. Therefore, the insulating bush 5 made of epoxy resin and the like has longer service life and does not need frequent maintenance and replacement.

As shown in fig. 1, an inner flange 51 is provided on the inner wall of the insulating bush 5, the first permanent magnet 4 has a fixing portion 41 and a locking portion 42 coaxially connected, the fixing portion 41 is located between the buffer end cap 2 and the inner flange 51, and the inner flange 51 is located between the buffer cylinder 1 and the locking portion 42. Wherein the inner diameter of the inner flange 51 is smaller than the outer diameter of the fixing portion 41, so that the fixing portion 41 is confined in the buffer cylinder 1 and prevents the first permanent magnet 4 from sliding down from the buffer cylinder 1. In the embodiment of the present invention, the locking portion 42 is coaxially connected to the fixing portion 41, and therefore the locking portion 42 is also confined in the cushion cylinder 1 together with the fixing portion 41. The provision of the locking portions 42 at the inner flange 51 facilitates the locking portions 42 to be brought closer to the damping piston 3 to facilitate the locking portions 42 to attract the damping piston 3.

As shown in fig. 1, the damping piston 3 has a piston cylinder 31, the diameter of the piston cylinder 31 is not smaller than the inner diameter of the inner flange 51, and the axial length of the locking portion 42 is not greater than the axial length of the inner flange 51. In the embodiment of the invention, the diameter of the piston column 31 is not smaller than the inner diameter of the inner flange 51, so that after the piston column 31 enters the buffer cylinder 1, the inner flange 51 abuts against the piston column 31, and the piston column 31 is limited to move towards the buffer end cover 2, so that the buffer piston 3 is limited to the initial position. Meanwhile, the axial length of the locking part 42 is not greater than that of the inner flange 51, so that the piston column 31 does not penetrate through the inner flange 51 due to excessive impact of the buffer piston 3, and impacts the locking part 42 located on the inner flange 51, thereby protecting the first permanent magnet 4.

Optionally, the inner wall of the insulating bush 5 is provided with a conical surface, the outer wall of the piston rod 31 is in sliding fit with the conical surface, and the inner diameter of the conical surface is gradually reduced from the end far away from the inner flange 51 to the end close to the inner flange 51. The inner diameter of the conical surface is gradually reduced from one end far away from the inner flange 51 to one end close to the inner flange 51, so that the resistance of the piston column 31 close to the buffering end cover 2 is larger, the buffering piston 3 is prevented from causing larger impact damage to the buffering end cover 2 and the first permanent magnet 4, and the safety of the return stroke buffering device is improved.

As shown in fig. 1, the piston rod of the buffer piston 3 is provided with an annular protrusion 32, the outer diameter of the annular protrusion 32 is not smaller than the outer diameter of the buffer cylinder 1, and the end surface of one end of the buffer cylinder 1 far away from the buffer end cover 2 and the end surface of the annular protrusion 33 facing the buffer cylinder 1 are both provided with an annular buffer pad 6. The annular buffer cushion 6 is used for relieving the impact force between the buffer cylinder 1 and the buffer piston 3, and the effect of protecting the buffer cylinder 1 and the buffer piston 3 is achieved.

Optionally, the annular cushion 6 is detachably connected with the annular protrusion 32 and the cushion cartridge 1. In the embodiment of the present invention, the annular cushion 6 is fixed to the annular protrusion 32 and the cushion cylinder 1 by bolts or screws. The connection mode is convenient to detach and mount. Wherein, a plurality of counter bores (as shown in fig. 1) are arranged on the annular buffer cushion 6 at equal intervals in the circumferential direction and are used for installing bolts or screws, so that the surface of the annular buffer cushion 6 is smoother, and the bolts or screws used for fixing are prevented from directly colliding with each other and being impacted when the annular bulge 32 collides with the buffer cylinder 1.

In the embodiment of the present invention, the return buffer device may further include a shim plate 7, and the shim plate 7 is located between the ring-shaped buffer pad 6 and the buffer tube 1 (see fig. 1). Wherein the adjusting shim plate 7 together with the ring-shaped cushion pad 6 is fixed on the end face of the cushion tube 1 by bolts or screws. An adjusting shim plate 7 is provided on the damping cylinder 1 for adjusting the position at which the damping piston 3 is finally stopped in the damping cylinder 1, i.e. for accurately adjusting the damping piston 3 to the initial position.

As shown in fig. 1, the ring-shaped cushion 6 and the cushion end cap 2 are provided with rubber blocks 8. Set up the rubber block 8 on buffering end cover 2 and be used for supporting first permanent magnet 4 to alleviate the impact force that first permanent magnet 4 received, and prevent that first permanent magnet 4 and buffering end cover 2 from striking, improve the security. Set up the block rubber 8 on annular blotter 6 and be used for further buffering to alleviate the impact force between buffer cylinder 1 and the buffering piston 3, prevent that strong striking from appearing in buffer cylinder 1 and buffering piston 3, protection buffer cylinder 1 and buffering piston 3. Wherein the rubber block 8 can be connected and fixed on the annular buffer cushion 6 and the buffer end cover 2 by adopting a rubber vulcanization process.

In some embodiments of the present invention, the rubber block 8 may be in a circular truncated cone shape or a truncated pyramid shape, the end with the larger size in the circular truncated cone shape or the truncated pyramid shape is disposed in the counterbore of the annular cushion pad 6, the end with the smaller size in the circular truncated cone shape or the truncated pyramid shape protrudes out of the annular cushion pad 6, and the size of the end with the larger size in the circular truncated cone shape or the truncated pyramid shape is larger than the size of the counterbore of the annular cushion pad 6, so that the friction force between the rubber block 8 and the counterbore of the annular cushion pad 6 can be increased, and the rubber block 8 is prevented from being easily separated. Wherein, the rubber blocks and the bolts are alternately arranged in the counter bores in sequence.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A backhaul buffering apparatus, comprising: buffer cylinder (1), buffering end cover (2) and buffer piston (3), the one end of buffer cylinder (1) is equipped with buffer end cover (2), buffer piston (3) cartridge is in buffer cylinder (1), the outer wall of buffer piston (3) with the inner wall sliding fit of buffer cylinder (1), its characterized in that, be equipped with at least one earial drainage hole (10) on the lateral wall of buffer cylinder (1), the aperture of earial drainage hole (10) is from being located the one end of the inner wall of buffer cylinder (1) arrives the one end of the outer wall of buffer cylinder (1) reduces gradually, return stroke buffer still includes first permanent magnet (4), first permanent magnet (4) are located be close to in buffer cylinder (1) one side of buffering end cover (2), buffer piston (3) are metallic structure spare.

2. The return damping device according to claim 1, characterized in that a second permanent magnet (30) is arranged on the end face of the damping piston (3) facing the end of the first permanent magnet (4).

3. The return damping device according to claim 1 or 2, characterized in that it further comprises an insulating bushing (5), said insulating bushing (5) being inserted inside the damping cylinder (1) and between the damping cylinder (1) and the damping piston (3).

4. The return stroke buffering device according to claim 3, wherein an inner flange (51) is provided on the inner wall of the insulating bush (5), the first permanent magnet (4) has a fixing portion (41) and a locking portion (42) which are coaxially connected, the fixing portion (41) is located between the buffering end cover (2) and the inner flange (51), and the inner flange (51) is located between the buffering cylinder (1) and the locking portion (42).

5. The return damping arrangement according to claim 4, characterized in that the damping piston (3) has a piston cylinder (31), the diameter of the piston cylinder (31) being not smaller than the inner diameter of the inner flange (51), the axial length of the locking portion (42) being not greater than the axial length of the inner flange (51).

6. The return damping device according to claim 5, characterized in that the inner wall of the insulating bush (5) is provided with a tapered surface, the outer wall of the piston post (31) is in sliding fit with the tapered surface, and the inner diameter of the tapered surface is gradually reduced from the end far away from the inner flange (51) to the end near the inner flange (51).

7. The return stroke buffering device according to claim 1 or 2, wherein the piston rod of the buffering piston (3) is provided with an annular protrusion (32), the outer diameter of the annular protrusion (32) is not smaller than the outer diameter of the buffering cylinder (1), and an annular buffering pad (6) is arranged on both the end surface of the buffering cylinder (1) far away from the buffering end cover (2) and the end surface of the annular protrusion (32) facing the buffering cylinder (1).

8. Return buffering device according to claim 7, characterized in that the annular cushion (6) is detachably connected to the annular protrusion (32) and the buffer cylinder (1).

9. The return buffering device according to claim 7, characterized in that the ring-shaped buffer pad (6) and the buffer end cap (2) are provided with rubber blocks (8).