CN216382059U

CN216382059U - Hydraulic cylinder with adjustable stroke

Info

Publication number: CN216382059U
Application number: CN202122941462.1U
Authority: CN
Inventors: 沈翔; 徐超
Original assignee: Changzhou Hydraulic Complete Equipment Co ltd
Current assignee: Changzhou Hydraulic Complete Equipment Co ltd
Priority date: 2021-11-26
Filing date: 2021-11-26
Publication date: 2022-04-26
Anticipated expiration: 2031-11-26

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder with adjustable stroke, which comprises a cylinder body, a piston rod, a piston, a cylinder head and an adjusting ring, wherein the piston is arranged in the cylinder body in a sliding manner, the cylinder head is arranged at the front end of the cylinder body, an extending part extends into the cylinder body and is connected with the inner wall of the cylinder body in a sliding manner, the adjusting ring is sleeved outside the extending part, the adjusting ring comprises a plurality of arc-shaped blocks, and the adjusting ring is clamped between the front end surface of the cylinder body and the rear end surface of the cylinder head, meanwhile, the device has the advantages of simple structure, low cost and the like.

Description

Hydraulic cylinder with adjustable stroke

Technical Field

The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder with an adjustable stroke.

Background

The hydraulic cylinder is a common hydraulic actuating element and has a very wide application field, as is well known, the hydraulic cylinder mainly comprises a cylinder body, a piston and a piston rod, the stroke of the hydraulic cylinder is fixed after the hydraulic cylinder is assembled, if the working condition is changed and the stroke needs to be adjusted, the hydraulic cylinder needs to be completely disassembled, and parts are replaced, so that the time and labor are wasted; therefore, a plurality of hydraulic cylinders with adjustable strokes appear in the prior art, but the structures of the cylinder body or the cylinder head generally need to be adjusted greatly, so that the structure is complex, the cost is high, and the failure rate is high.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: in order to solve the problems that the structure of a cylinder body or a cylinder head is generally required to be greatly adjusted in the hydraulic cylinder with adjustable stroke in the prior art, the structure is complex, the cost is high and the failure rate is high, the hydraulic cylinder with adjustable stroke is provided.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a hydraulic cylinder with adjustable stroke comprises a cylinder body, a piston rod, a piston, a cylinder head and an adjusting ring, wherein the piston is arranged in the cylinder body in a sliding mode, the piston rod is fixedly connected with the piston, an extension part coaxially protrudes from the rear end surface of the cylinder head, the cylinder head is arranged at the front end of the cylinder body, the extension part extends into the cylinder body and is connected with the inner wall of the cylinder body in a sliding mode, and the piston rod penetrates through the extension part and the cylinder head;

the front end of the cylinder body is fixed with a connecting flange, the adjusting ring is sleeved outside the extending portion, the adjusting ring comprises a plurality of arc-shaped blocks, the arc-shaped blocks are circumferentially arranged to form the adjusting ring, a plurality of screws are arranged on the connecting flange, the threaded ends of the screws are in threaded connection with the cylinder head, and the adjusting ring is clamped between the front end face of the cylinder body and the rear end face of the cylinder head.

Through the design of split type adjusting ring in this scheme, dismantle the back at the screw, need not dismantle the cylinder head, alright realize the quantity of freely increasing and decreasing adjusting ring to this changes the interval between piston and the extension, thereby reaches the purpose that changes the piston rod stroke, has improved the commonality greatly, changes the working stroke and need not unpack apart a whole hydro-cylinder, need not make the part again, has saved a lot of time, can not have the risk of dismouting in-process sealing member damage, has simple structure concurrently simultaneously, advantage such as with low costs.

Furthermore, through holes for screws to pass through are formed in the arc-shaped blocks of the adjusting ring, each through hole corresponds to one screw, and the screws pass through the corresponding through holes and then are in threaded connection with the cylinder head; utilize the arc piece that the screw passed the adjusting ring, can effectively improve the fastness of each arc piece installation of adjusting ring.

Furthermore, a sealing ring is embedded in the outer peripheral surface of the extending portion and is in contact with the inner wall of the cylinder body, a rod cavity is formed in a space formed between the rear end surface of the extending portion and the front end surface of the piston, an oil inlet is formed in the cylinder body, an annular gap is reserved between the inner peripheral wall of the extending portion and the outer peripheral surface of the piston rod, and the oil inlet is communicated with the rod cavity through the annular gap; this achieves that the sealing properties at the cylinder head are maintained during the stroke adjustment.

Furthermore, the front end face of the connecting flange is flush with the front end face of the cylinder body, so that the contact area between the connecting flange and the adjusting ring can be increased, and the reliability and the stability of connection are improved.

The utility model has the beneficial effects that: according to the stroke-adjustable hydraulic cylinder, due to the design of the split type adjusting ring, after the screw is disassembled, the number of the adjusting rings can be freely increased and decreased without disassembling the cylinder head, so that the distance between the piston and the extending part is changed, the purpose of changing the stroke of the piston rod is achieved, the universality is greatly improved, the whole cylinder does not need to be disassembled when the working stroke is changed, parts do not need to be manufactured again, much time is saved, the risk of damaging a sealing piece in the disassembling and assembling process is avoided, and the stroke-adjustable hydraulic cylinder has the advantages of simple structure, low cost and the like.

Drawings

The utility model is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic view of a stroke adjustable hydraulic cylinder of the present invention;

FIG. 2 is an enlarged partial schematic view of A of FIG. 1;

FIG. 3 is a schematic view of an adjustment ring of the present invention.

In the figure: 1. the cylinder comprises a cylinder body, 2, a piston rod, 3, a piston, 4, a cylinder head, 401, an extension part, 402, an oil inlet, 5, an adjusting ring, 501, an arc-shaped block, 5011, a through hole, 6, a screw, 7, a sealing ring, 8, a connecting flange, 9, a rod cavity, 10 and an annular gap.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. The drawings are simplified schematic diagrams illustrating the basic structure of the present invention only in a schematic manner, and thus show only the constitution related to the present invention, and directions and references (e.g., upper, lower, left, right, etc.) may be used only to help the description of the features in the drawings. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the claimed subject matter is defined only by the appended claims and equivalents thereof.

Example 1

As shown in fig. 1-3, a hydraulic cylinder with adjustable stroke comprises a cylinder body 1, a piston rod 2, a piston 3, a cylinder head 4 and an adjusting ring 5, wherein the piston 3 is slidably arranged in the cylinder body 1, the piston rod 2 is fixedly connected with the piston 3, an annular extension 401 coaxially protrudes from the rear end surface of the cylinder head 4, the cylinder head 4 is installed at the front end of the cylinder body 1, the extension 401 extends into the cylinder body 1 and is slidably connected with the inner wall of the cylinder body 1, and the piston rod 2 passes through the extension 401 and the cylinder head 4;

the front end of cylinder body 1 is fixed with flange 8, and flange 8 specifically adopts screw thread or welded mode to fix the front end at cylinder body 1, and flange 8's preceding terminal surface flushes with the preceding terminal surface of cylinder body 1, can increase the area of contact with adjusting ring 5, improves the reliability and the stability of connecting, adjusting ring 5 cover is established outside extension 401, and wherein, adjusting ring 5 includes two arc pieces 501, and two arc pieces 501 set up along circumference and form adjusting ring 5, the tip of two arc pieces 501 of same adjusting ring 5 contact each other or contactless, be equipped with a plurality of screws 6 on flange 8, the screw end and the cylinder head 4 threaded connection of screw 6, adjusting ring 5 is pressed from both sides tightly between the preceding terminal surface of cylinder body 1 and the rear end face of cylinder head 4.

Through holes 5011 for screws 6 to pass through are formed in the arc-shaped blocks 501 of the adjusting ring 5, each through hole 5011 corresponds to one screw 6, and the screws 6 pass through the corresponding through holes 5011 and then are in threaded connection with the cylinder head 4; utilize screw 6 to pass the arc piece 501 of adjusting ring 5, can effectively improve the fastness of each arc piece 501 installation of adjusting ring 5.

A sealing ring 7 is embedded in the outer peripheral surface of the extension portion 401, the sealing ring 7 is in contact with the inner wall of the cylinder body 1, a rod cavity 9 is formed in a space formed between the rear end surface of the extension portion 401 and the front end surface of the piston 3, an oil inlet 402 is formed in the cylinder body 1, an annular gap 10 is reserved between the inner peripheral wall of the extension portion 401 and the outer peripheral surface of the piston rod 2, and the oil inlet 402 is communicated with the rod cavity 9 through the annular gap 10; this achieves that the sealing properties at the cylinder head 4 are maintained during the stroke adjustment.

In the using process of the hydraulic cylinder with the adjustable stroke, if the stroke needs to be shortened, the screws 6 are completely unscrewed, the adjusting ring 5 is removed, then the cylinder head 4 is pushed towards the direction of closing the cylinder body 1, the screws 6 are screwed again, and the distance between the piston 3 and the extension part 401 is shortened, so that the purpose of shortening the stroke is achieved; if the stroke is increased, firstly, the screws 6 are completely screwed off, then the cylinder head 4 is pushed away from the cylinder body 1, then the adjusting ring 5 is additionally installed, the screws 6 are screwed again, and the distance between the piston 3 and the extension part 401 is increased, so that the purpose of increasing the stroke is achieved;

when the number of the adjusting rings 5 is 2 or more than 2, the adjusting rings 5 are distributed in sequence along the axial direction of the cylinder body 1; when the screw 6 is unscrewed, each arc-shaped block 501 of the adjusting ring 5 can be separated from the cylinder body 1 along the radial direction, the cylinder head 4 does not need to be detached from the cylinder body 1, the number of the adjusting rings 5 can be freely increased or decreased, the distance between the piston 3 and the extension 401 is changed, the purpose of changing the stroke of the piston rod 2 is achieved, the universality is greatly improved, the whole oil cylinder does not need to be detached when the working stroke is changed, parts do not need to be manufactured again, a lot of time is saved, the risk of damage to sealing parts in the dismounting process is avoided, and the structure is simple, the cost is low and the like.

In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A stroke adjustable hydraulic cylinder, characterized by: the piston rod type cylinder comprises a cylinder body (1), a piston rod (2), a piston (3), a cylinder head (4) and an adjusting ring (5), wherein the piston (3) is arranged in the cylinder body (1) in a sliding mode, the piston rod (2) is fixedly connected with the piston (3), an extension part (401) coaxially protrudes from the rear end face of the cylinder head (4), the cylinder head (4) is installed at the front end of the cylinder body (1), the extension part (401) extends into the cylinder body (1) and is connected with the inner wall of the cylinder body (1) in a sliding mode, and the piston rod (2) penetrates through the extension part (401) and the cylinder head (4);

the front end of cylinder body (1) is fixed with flange (8), adjusting ring (5) cover is established outside extension (401), and wherein, adjusting ring (5) include a plurality of arc pieces (501), and a plurality of arc pieces (501) set up along circumference and form adjusting ring (5), be equipped with a plurality of screws (6) on flange (8), the screw end and the cylinder head (4) threaded connection of screw (6), adjusting ring (5) are pressed from both sides tightly between the rear end face of the preceding terminal surface of cylinder body (1) and cylinder head (4).

2. The adjustable stroke hydraulic cylinder of claim 1, wherein: through holes (5011) for screws (6) to pass through are formed in the arc-shaped blocks (501) of the adjusting ring (5), each through hole (5011) corresponds to one screw (6), and the screws (6) pass through the corresponding through holes (5011) and then are in threaded connection with the cylinder head (4).

3. The adjustable stroke hydraulic cylinder of claim 1, wherein: the piston rod structure is characterized in that a sealing ring (7) is embedded into the outer peripheral surface of the extension portion (401), the sealing ring (7) is in contact with the inner wall of the cylinder body (1), a rod cavity (9) is arranged in a space formed between the rear end surface of the extension portion (401) and the front end surface of the piston (3), an oil inlet (402) is formed in the cylinder body (1), an annular gap (10) is reserved between the inner peripheral wall of the extension portion (401) and the outer peripheral surface of the piston rod (2), and the oil inlet (402) is communicated with the rod cavity (9) through the annular gap (10).

4. The adjustable stroke hydraulic cylinder of claim 1, wherein: the front end face of the connecting flange (8) is flush with the front end face of the cylinder body (1).