CN206592369U - A kind of band buffering hydraulic cylinder - Google Patents

Abstract

The utility model discloses a hydraulic cylinder with a buffer, which comprises a cylinder body, a piston rod and a piston matched with the cylinder body, an oil pipe is arranged inside the piston rod, a guide sleeve and a buffer ring are arranged inside the piston, and the guide sleeve and the buffer ring are arranged inside the piston rod. The sleeve is in communication with the oil pipe, the cylinder body is provided with a buffer plunger, and the buffer plunger is provided with a buffer cavity close to one end of the piston, and the buffer plunger is also provided with the buffer Two or more rows of throttling holes that are connected to each other along the axial direction of the buffer plunger. When entering the later stage of the stroke, the buffer plunger passes through the buffer ring and extends into the guide sleeve, and the buffer column The plug is in sealing fit with the buffer ring, and the buffer plunger is in clearance fit with the guide sleeve. The utility model has relatively simple structure, low manufacturing price and low maintenance cost, and can effectively solve the problem of lack of cushioning in hydraulic cylinders with internal oil pipes on piston rods.

Description

A buffer hydraulic cylinder

technical field

The utility model relates to the field of hydraulic cylinders, in particular to a hydraulic cylinder with a buffer.

Background technique

A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swing motion). It has simple structure and reliable operation. When it is used to realize reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the motion is stable, so it is widely used in various mechanical hydraulic systems.

At the end of the stroke of the existing hydraulic cylinder, the piston often impacts the cylinder barrel due to inertia, resulting in unstable flow and damaging the hydraulic parts. The hydraulic cylinder with buffer just arises at the historic moment like this, but there is a hydraulic cylinder with a type of piston rod with an internal oil pipe that has few buffer devices due to its structural particularity.

Utility model content

The technical problem to be solved by the utility model is to provide a hydraulic cylinder with a buffer, which can effectively solve the problem of a lack of buffer in a hydraulic cylinder with an internal oil pipe on the piston rod.

In order to solve the above technical problems, the utility model adopts the following technical scheme: a hydraulic cylinder with buffer, including a cylinder body and a piston rod and a piston matched with the cylinder body, the piston rod is provided with an oil pipe, and the piston is provided with A guide sleeve and a buffer ring, the guide sleeve communicates with the oil pipe, the cylinder body is provided with a buffer plunger, and the buffer plunger is provided with a buffer cavity close to one end of the piston, and the buffer column The plug is also provided with more than two rows of throttling holes that are communicated with the buffer cavity and are spaced along the axial direction of the buffer plunger. The buffer plunger is in sealing fit with the buffer ring, and the buffer plunger is in clearance fit with the guide sleeve.

Further, the front end of the piston rod is connected to the ear plate, and the rear end is connected to the piston rod head, and the front end of the oil pipe is connected to the ear plate, and the rear end is connected to the piston rod head.

Further, the ear plate is provided with a first oil hole leading to the gap between the oil pipe and the piston rod and a second oil hole leading to the inner cavity of the oil pipe.

Further, the front end of the guide sleeve is provided with a radially outwardly protruding first flange, the front end of the piston is provided with a first groove, and the first flange is stuck in the first groove Inside, the rear end of the oil pipe passes through the piston rod head to axially limit the guide sleeve.

Further, the cylinder body includes a cylinder barrel, a cylinder liner connected to the front end of the cylinder barrel, and a cylinder bottom connected to the rear end of the cylinder barrel.

Further, the rear end of the buffer plunger extends into the cylinder bottom, there is a gap between the front end of the cylinder bottom and the buffer plunger, and the rearmost row of throttle holes and the cylinder bottom The front end communicates with the gap between the buffer plungers.

Further, the rear end of the buffer plunger extends into the cylinder bottom, the rear end of the buffer plunger is provided with a second flange protruding radially outward, and the rear end surface of the cylinder bottom is provided with a second flange. Two grooves, the second flange is clamped in the second groove and axially limited by the pressure plate fixed on the cylinder bottom.

Further, the guide sleeve and the piston are movably matched in the radial direction, and there is a gap of 10 wires on one side between the guide sleeve and the piston.

Further, there is a gap of 40 wires on one side between the buffer plunger and the guide sleeve.

The beneficial effects of the utility model are:

In the working process of the utility model, when the piston returns, the hydraulic oil in the rodless chamber of the hydraulic cylinder enters the oil pipe through the guide sleeve and the buffer ring to realize oil return. The buffer ring is sealed with the buffer ring, so the above-mentioned oil return passage is blocked, and the hydraulic oil cannot pass through. At this time, the hydraulic oil enters the buffer chamber of the buffer plunger from the orifice located at the rear side of the buffer ring, and then flows from the buffer chamber located at the buffer ring. The throttle hole on the front side of the ring enters the gap between the buffer plunger and the guide sleeve, and finally enters the oil pipe to achieve the effect of throttling and buffering.

In addition, the utility model has relatively simple structure, low manufacturing cost and low maintenance cost. It can effectively solve the problem of lack of cushioning in hydraulic cylinders with internal oil pipes on the piston rod, and can replace the cushioning plunger at any time according to actual cushioning requirements.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the utility model.

The marks of each part in the accompanying drawings are: 1 cylinder body, 11 cylinder barrel, 12 cylinder liner, 13 cylinder bottom, 14 cylinder head, 2 piston rod, 21 third oil hole, 3 piston, 4 oil pipe, 5 guide sleeve, 51 First flange, 6 buffer ring, 7 buffer plunger, 71 buffer chamber, 72 throttle hole, 73 second flange, 8 ear plate, 81 first oil hole, 82 second oil hole, 9 piston rod head, 10 platens.

detailed description

The utility model will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

See Figure 1.

A buffer hydraulic cylinder according to an embodiment of the present utility model includes a cylinder body 1 and a piston rod 2 and a piston 3 matched with the cylinder body 1, the piston rod 2 is provided with an oil pipe 4, and the piston 3 is provided with a guide sleeve 5 and a buffer ring 6, the guide sleeve communicates with the oil pipe 4, the cylinder body 1 is provided with a buffer plunger 7, and the buffer plunger 7 is provided with a buffer cavity close to the opening of one end of the piston 3 71, the buffer plunger 7 is also provided with more than two rows of throttle holes 72 that are communicated with the buffer chamber 71 and distributed along the axial interval of the buffer plunger 7, and enter the later stage of the stroke, the buffer plunger 7 passes through the buffer ring 6 and extends into the guide sleeve 5, and the buffer plunger 7 is in sealing fit with the buffer ring 6, and the buffer plunger 7 is in clearance fit with the guide sleeve 5.

During the working process of the hydraulic cylinder, when the piston returns, the hydraulic oil in the rodless chamber of the hydraulic cylinder enters the oil pipe through the guide sleeve and the buffer ring to realize oil return. The buffer ring is sealed with the buffer ring, so the above-mentioned oil return passage is blocked, and the hydraulic oil cannot pass through. At this time, the hydraulic oil enters the buffer cavity of the buffer plunger from the orifice located at the rear side of the buffer ring, and then flows from the buffer ring located at the back of the buffer ring. The throttle hole on the front side enters the gap between the buffer plunger and the guide sleeve, and finally enters the oil pipe to achieve the effect of throttling and buffering.

A common structure of a cylinder 1 is illustrated in the figure, and the cylinder 1 includes a cylinder 11 , a cylinder liner 12 connected to the front end of the cylinder 11 , and a cylinder bottom 13 connected to the rear end of the cylinder 11 . In specific implementation, the cylinder barrel 11 is welded to the cylinder bottom 13, and a cylinder head 14 is welded to the front end of the cylinder barrel 11, and then the cylinder liner 12 is connected to the cylinder head 14 through threads.

In the present utility model, there is at least one throttling hole 72 in each row, and each row of throttling holes 72 is distributed along the circumferential direction of the buffer plunger 7, and the rows are distributed at intervals along the axial direction of the buffer plunger 7, as shown in Fig. The orifice is set in four rows in the example. Preferably, the rear end of the buffer plunger 7 extends into the cylinder bottom 13, there is a gap between the front end of the cylinder bottom 13 and the buffer plunger 7, and the rearmost row of throttle holes 72 and The front end of the cylinder bottom 13 communicates with the gap between the buffer plunger 7, so designed that even when the piston moves to the limit position, the rearmost row of throttle holes 72 is still located at the rear side of the buffer ring. Guaranteed throttling timeliness.

In one embodiment, the buffer plunger 7 is installed through the following structure, the rear end of the buffer plunger 7 protrudes into the cylinder bottom 13, and the rear end of the buffer plunger 7 is provided with radially outwardly protruding The second flange 73, the rear end surface of the cylinder bottom 13 is provided with a second groove, the second flange 73 is stuck in the second groove and passes through the pressure plate fixed on the cylinder bottom 13 10 to realize the axial limit. This structure is not only easy to install, but also can be disassembled and assembled repeatedly, and the buffer plunger can be replaced at any time according to the actual buffer requirements, which has strong practicability.

In one embodiment, the front end of the piston rod 2 is connected to the ear plate 8, and the rear end is connected to the piston rod head 9. The front end of the oil pipe 4 is connected to the ear plate 8, and the rear end is connected to the piston rod 4. On the rod head 9, the piston 3 is connected with the piston rod head 9 by threads. This structure is convenient for installation and molding.

In one embodiment, the piston rod 2 is a hollow structure, and the ear plate 8 is provided with a first oil hole 81 leading to the gap between the oil pipe 4 and the piston rod 2 and a first oil hole 81 leading to the oil pipe 4. The second oil hole 82 in the inner cavity of the piston rod 2 is provided with the third oil hole 21 communicating with the rod cavity of the hydraulic cylinder and the inner cavity of the piston rod 2 .

During the working process of the hydraulic cylinder, when the hydraulic oil enters the rod chamber of the hydraulic cylinder through the first oil hole 81 and the third oil hole 21 in sequence, the piston rod and the piston move to the right, while the hydraulic oil in the rodless chamber enters After the oil pipe, enter the oil return pipe through the second oil hole 82.

In one embodiment, the front end of the guide sleeve 5 is provided with a radially outwardly protruding first flange 51, and the front end of the piston 3 is provided with a first groove, and the first flange 51 snaps into place. In the first groove, the rear end of the oil pipe 4 passes through the piston rod head 9 to axially limit the guide sleeve 5 . This structure has a reasonable design and the guide sleeve is easy to install.

In one embodiment, the guide sleeve 5 and the piston 3 are movably matched in the radial direction, and there is a gap of 10 wires on one side between the guide sleeve 5 and the piston 3 . With this design, the guiding effect is better and the coaxiality is higher when used.

In one embodiment, there is a gap of 40 wires on one side between the buffer plunger 7 and the guide sleeve 5 . In the process of implementing the utility model, the inventors found that under this cooperation degree, the throttling and buffering effect is better and the safety is higher.

In the utility model, seals are installed at the contact parts of each component, except for welding parts.

It should be understood that the examples and implementations described herein are for illustration only, and are not intended to limit the utility model, and those skilled in the art can make various modifications or changes based on it, and all within the spirit and principles of the utility model, the Any modification, equivalent replacement, improvement, etc., should be included in the protection scope of the present utility model.

Claims (9)

1. a kind of band buffering hydraulic cylinder, including cylinder body (1) and piston rod (2) and piston (3) with cylinder body (1) cooperation, described Oil pipe (4) is provided with piston rod (2), it is characterised in that：Guide sleeve (5) and buffering ring (6) are provided with the piston (3), it is described Guide sleeve is connected with the oil pipe (4), and the cylinder body (1) is provided with buffer plunger (7), and the buffer plunger (7) is provided with and leaned on It is additionally provided with the cushion chamber (71) of the one end open of the nearly piston (3), the buffer plunger (7) with the cushion chamber (71) even The throttle orifice (72) being distributed along the buffer plunger (7) axially spaced-apart more than two logical rows, into stroke later stage, the buffering Plunger (7) is stretched into the guide sleeve (5) through the buffering ring (6), and the buffer plunger (7) and the buffering ring (6) Sealing coordinates, and the buffer plunger (7) coordinates with the guide sleeve (5) gap.

2. band buffering hydraulic cylinder as claimed in claim 1, it is characterised in that：The front end of the piston rod (2) is connected with otic placode (8), rear end is connected with piston rod head (9), the front end of the oil pipe (4) is connected on the otic placode (8), rear end be connected to it is described On piston rod head (9).

3. band buffering hydraulic cylinder as claimed in claim 2, it is characterised in that：The otic placode (8), which is provided with, leads to the oil pipe (4) first oilhole (81) in the gap between the piston rod (2) and lead to the oil pipe (4) inner chamber the second oilhole (82)。

4. band buffering hydraulic cylinder as claimed in claim 2, it is characterised in that：The front end of the guide sleeve (5) provided with radially to The first flange (51) overhang, the front end face of the piston (3) is provided with the first groove, and first flange (51) is stuck in described In first groove, piston rod head (9) described in the rear end insertion of the oil pipe (4) carries out axial limiting to the guide sleeve (5).

5. band buffering hydraulic cylinder as claimed in claim 1 or 2, it is characterised in that：The cylinder body (1) includes cylinder barrel (11), connected The cylinder sleeve (12) for being connected on the front end of cylinder barrel (11) and the cylinder bottom (13) for the rear end for being connected to cylinder barrel (11).

6. band buffering hydraulic cylinder as claimed in claim 5, it is characterised in that：The rear end of the buffer plunger (7) is stretched into described Cylinder bottom (13), has gap, a cribbing discharge orifice most rearward between the front end of the cylinder bottom (13) and the buffer plunger (7) (72) connected with the front end of cylinder bottom this described (13) with the gap between the buffer plunger (7).

7. band buffering hydraulic cylinder as claimed in claim 5, it is characterised in that：The rear end of the buffer plunger (7) is stretched into described Cylinder bottom (13), the rear end of the buffer plunger (7) is provided with after the second flange (73) extended radially out, the cylinder bottom (13) End face is provided with the second groove, and second flange (73) is stuck in second groove and by being fixed on the cylinder bottom (13) Pressing plate (10) realize axial limiting.

8. band buffering hydraulic cylinder as claimed in claim 1 or 2, it is characterised in that：The guide sleeve (5) and the piston (3) Diametrically activity coordinates, and has the gap of unilateral 10 between the guide sleeve (5) and the piston (3).

9. band buffering hydraulic cylinder as claimed in claim 1 or 2, it is characterised in that：The buffer plunger (7) and the guide sleeve (5) there is the gap of unilateral 40 between.