CN216842472U - Double-piston hydraulic oil cylinder - Google Patents

Abstract

The utility model provides a double-piston hydraulic oil cylinder, which comprises a cylinder body, a piston rod, a first limiting block and a second limiting block, wherein one end of the piston rod, which is positioned inside the cylinder body, is connected with the piston, and the first limiting block and the second limiting block are connected with one end of the piston rod, which is far away from the cylinder body; the piston rod includes main piston rod and deputy piston rod, the inside coaxial through hole that sets up of main piston rod, deputy piston rod and the inside through hole sliding fit of main piston rod, cylinder body one end fixed connection is kept away from to first stopper and main piston rod, the position of first limiting plate through hole sets up the via hole on corresponding main piston rod, the one end fixed connection of cylinder body is kept away from to second stopper and deputy piston rod. The utility model provides a hydraulic cylinder can not lead to the motion of piston and control the state of piston rod end connection part to make hydraulic cylinder can switch by oneself with the connection status of work part.

Description

A double-piston hydraulic cylinder

technical field

The utility model relates to the technical field of oil cylinders, in particular to a double-piston hydraulic oil cylinder.

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 using it to achieve reciprocating motion, the reduction device can be omitted, and there is no transmission gap, and the movement is stable, so it is widely used in various mechanical hydraulic systems. In the prior art, when the piston rod of the hydraulic cylinder is connected with other parts, the connection method used is fixed connection, and the connection state cannot be controlled by the pressure generated when the hydraulic pump drives the piston assembly to move. Hydraulic cylinders are often used in automated production lines. The piston rod needs to move the position of the working parts during the reciprocating motion, but other equipment or manual assistance is required to complete the connection with the working parts. In the prior art, the hydraulic cylinder itself cannot be used to stabilize and work. The connected state of the connection, so a new device is required.

Utility model content

Aiming at the deficiencies in the prior art, the utility model provides a dual-piston hydraulic oil cylinder, which solves the problem in the prior art that the connection state with the working parts cannot be controlled by the hydraulic pressure moving inside the cylinder.

According to an embodiment of the present invention, a dual-piston hydraulic oil cylinder includes a cylinder block, a piston assembly, a piston rod, a first limit block and a second limit block, wherein the piston rod, the piston assembly and the cylinder block are coaxially arranged One end of the piston rod inside the cylinder is connected to the piston assembly, the first limit block and the second limit block are connected to the end of the piston rod away from the cylinder, and the first limit block and the second limit block are mutually parallel and spaced apart from each other;

The piston rod includes a primary piston rod and a secondary piston rod. A coaxial through hole is arranged inside the primary piston rod. The secondary piston rod is slidably matched with the through hole inside the primary piston rod, and both ends of the secondary piston rod extend. The first limit block is connected with the end of the main piston rod away from the cylinder, and the first limit plate is provided with a through hole at the position corresponding to the through hole on the main piston rod, so that one end of the auxiliary piston rod passes through the through hole. The hole protrudes, and the second limit block is connected with one end of the auxiliary piston rod away from the cylinder; the piston assembly can make the auxiliary piston rod slide in the main piston rod.

Preferably, the piston assembly includes a first piston, a second piston and a spring, the first piston and the main piston rod are connected at one end of the cylinder, and the end of the auxiliary piston rod is arranged in the cylinder through the first piston A piston is then connected to a second piston; one end of the spring is connected to the first piston and the other end is connected to the second piston.

Preferably, the piston assembly further includes a first limiting column and a second limiting column, the first limiting column and the second limiting column are both cylindrical through-hole structures, and the first limiting column is coaxially sleeved on the Outside the second limit post, and the inner hole diameter of the first limit post is adapted to the outer diameter of the second limit post; the axially shrunk lengths of the first limit post and the second limit post are less than The length of the spring in the initial state; the ends of the first limit post and the second limit post away from each other are respectively fixedly connected with the first piston and the second piston and coaxial with the cylinder.

Preferably, the springs are evenly distributed radially around the axis of the cylinder in the cylinder.

Compared with the prior art, the utility model has the following beneficial effects: when the hydraulic pump controls the reciprocating motion of the piston assembly, the first piston and the second piston are driven to approach each other, so that the first limit block and the second limit The distance between the position blocks is increased, and the movable connection with the working parts is completed by the pulling force between the first limit block and the second limit block. When the piston assembly completes the one-way movement, the first limit block and The distance of the second limit block is close again, and the separation from the working part is completed automatically; in this way, the reciprocating operation can realize the cyclic operation without other equipment or manual assistance.

Description of drawings

FIG. 1 is a structural diagram of an embodiment of the present utility model.

FIG. 2 is a schematic diagram of the connection between the hydraulic cylinder and the working parts according to the embodiment of the present invention.

In the above drawings: 1. Cylinder block; 2. First limit block; 3. Second limit block; 4. Main piston rod; 5. Secondary piston rod; 6. First oil port; 7. Second oil mouth; 8, the first piston; 9, the second piston; 10, the spring; 11, the first limit post; 12, the second limit post; 13, the slot; 14, the working part; 15, the limit stage.

Detailed ways

The technical solutions in the present utility model are further described below with reference to the accompanying drawings and embodiments.

As shown in Figures 1 and 2, an embodiment of the present invention proposes a dual-piston hydraulic oil cylinder, which includes a cylinder block 1, a piston assembly, a piston rod, a first limit block 2 and a second limit block 3. The piston The rod, the piston assembly and the cylinder 1 are coaxially arranged, one end of the piston rod located inside the cylinder 1 is connected to the piston assembly, and the first limit block 2 and the second limit block 3 are connected to the end of the piston rod away from the cylinder 1 , the first limit block 2 and the second limit block 3 are parallel to each other and spaced apart from each other, and the two opposite faces of the first limit block 2 and the second limit block 3 are in contact with the working part 14 , the working part 14 is provided with a corresponding slot 13 at the corresponding position. When the piston assembly does not move, the farthest distance between the first limit block 2 and the second limit block 3 is smaller than the width of the slot 13, When the piston assembly starts to move, the distance between the first limit block 2 and the second limit block 3 is increased, and it is in close contact with the two sides of the slot 13 that needs to be connected to the working part 14 . The oil ports of the hydraulic cylinder are arranged on the side walls at both ends of the cylinder block 1, and the cylinder block 1 is provided with limit platforms 15 at both ends of the interior to prevent the piston assembly from moving to the oil port position and affecting the hydraulic oil to drive the piston movement. The oil ports include a first oil port 6 and a second oil port 7 . The first oil port 6 is close to the side of the first limit block 2 , and the second oil port 7 is on the side away from the first limit block 2 . When one of the first oil port 6 and the second oil port 7 receives oil, the other one is oil out, and the piston assembly is switched continuously after the unidirectional movement is completed. Because one of the oil ports pushes the piston assembly and squeezes the hydraulic oil out, instead of using external force to suck the oil out, the problem of simultaneous oil output or oil intake will not occur.

The piston rod includes a primary piston rod 4 and a secondary piston rod 5. A coaxial through hole is arranged inside the primary piston rod 4. Both ends of the rod 5 protrude through holes, the first limit block 2 and the main piston rod 4 are connected at one end away from the cylinder 1, and the first limit block 2 is provided with a through hole corresponding to the auxiliary piston rod 5, so that the auxiliary piston One end of the rod 5 protrudes through the through hole, and the second limiting block 3 is connected with the end of the auxiliary piston rod 5 away from the cylinder 1 . Said piston assembly enables the secondary piston rod 5 to slide within the primary piston rod 4 . The main piston rod 4 penetrates one end of the cylinder body 1 and uses a sealing ring at the contact position to ensure the tightness of the hydraulic cylinder. The first limit block 2 and the second limit block 3 are respectively connected with the main piston rod 4 and the auxiliary piston rod 5 by threaded connection, and the first limit block can be replaced according to the size or shape of the slot 13 to be connected. Block 2 and second limit block 3.

Preferably, the piston assembly includes a first piston 8, a second piston 9 and a spring 10, the first piston 8 and the main piston rod 4 are connected at one end of the cylinder 1, and the auxiliary piston rod 5 is provided in the One end in the cylinder 1 penetrates the first piston 8 and is then connected with the second piston 9 . In this example, the size of the first piston 8 and the second piston 9 are the same, and the size and model of the sealing ring used are the same, which is convenient for the replacement of the sealing ring during the subsequent maintenance of the hydraulic cylinder, and does not need to spend time looking for different types of sealing rings. One end of the spring 10 is connected to the first piston 8 and the other end is connected to the second piston 9. After the above piston assembly completes the one-way movement, it returns to the initial test state and maintains a sufficient distance.

Preferably, the piston assembly further includes a first limiting column 11 and a second limiting column 12 , the first limiting column 11 and the second limiting column 12 are both cylindrical through-hole structures, and the first limiting column 11 Coaxially sleeved on the outside of the second limit post 12, and the inner hole diameter of the first limit post 11 is matched with the outer diameter of the second limit post 12, the first limit post 11 can be compatible with the second limit post 12 slides relatively along the axis; the axially contracted length of the first limit post 11 and the second limit post 12 is smaller than the length of the spring 10 in the initial state; the first limit post 11 and the second limit post The ends of the columns 12 away from each other are fixedly connected with the first piston 8 and the second piston 9 respectively, and are coaxial with the cylinder 1 . In this example, the spring 10 and the first limit post 11 are coaxially arranged, the secondary piston rod 5 passes through the through hole of the second limit post 12, and the spring 10 is arranged on the first limit post 11 and the secondary piston rod 5 between the side walls. A first limit post 11 and a second limit post 12 are arranged between the first piston 8 and the second piston 9 to prevent the distance between the first piston 8 and the second piston 9 from being too small and damage to the spring 10 . The first limit post 11 and the second limit post 12 play a guiding role for the relative movement of the first piston 8 and the second piston 9, so as to prevent the first piston 8 and the second piston 9 from sliding to a certain side during movement. Improve the axis of the first piston 8 and the second piston 9 and the coaxiality of the cylinder 1, so that the gap between the outer wall of the first piston 8 and the second piston 9 and the cylinder 1 is uniform, and avoid the same position of the sealing ring and the cylinder 1 Excessive friction occurs on the inner wall, so as to protect the sealing rings provided on the first piston 8 and the second piston 9 and improve the service life.

Preferably, the springs 10 are evenly distributed in the cylinder 1 in the radial direction around the axis of the cylinder 1 . Make sure that the distance between the first limit block 2 and the second limit block 3 can be quickly reduced after the piston completes the one-way movement, and the service time of the spring 10 can also be extended by setting the appropriate quantity, without frequent replacement or maintenance of the spring 10.

Working principle: For example, when the hydraulic oil enters from the first oil port 6, the first piston 8 is pushed to move away from the first oil port 6, because the second oil port 7 is still on the second piston 9 when the oil is discharged. There is resistance, so the first piston 8 and the second piston 9 are close to each other, driving the auxiliary piston rod 5 to slide in the through hole of the main piston rod 4, thereby increasing the gap between the first limit block 2 and the second limit block 3 The distance is fixed with the slot 13 on the working part 14 in close contact with each other. When the piston assembly moves in the reverse direction, the second oil port 7 enters oil, and the hydraulic oil is squeezed out from the first oil port 6 . When the piston assembly moves from one end of the cylinder 1 to the other end, the force it receives is continuous, so the force of the first limit block 2 and the second limit block 3 moving away from each other is relatively continuous and stable. When the piston assembly completes the one-way stroke, the hydraulic pump temporarily stops working, and the spring 10 arranged inside the cylinder 1 pushes the first piston 8 and the second piston 9 away from each other, thereby reducing the first limit block 2 and the second Distance between limit blocks 3. Therefore, the position of the clamping groove 13 of the cylinder block 1 and the working part 14 is disconnected.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should The technical solutions are modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and all of them should be included in the scope of the claims of the present invention.

Claims (4)

1. A dual-piston hydraulic oil cylinder is characterized in that: it comprises a cylinder, a piston assembly, a piston rod, a first limit block and a second limit block, wherein the piston rod, the piston assembly and the cylinder are coaxially arranged, so that the The end of the piston rod located inside the cylinder is connected to the piston assembly, the first limit block and the second limit block are connected to the end of the piston rod away from the cylinder, the first limit block and the second limit block are parallel to each other and spaced from each other; The piston rod includes a primary piston rod and a secondary piston rod. A coaxial through hole is arranged inside the primary piston rod. The secondary piston rod is slidably matched with the through hole inside the primary piston rod, and both ends of the secondary piston rod extend. The first limit block is connected with the end of the main piston rod away from the cylinder, and the first limit plate is provided with a through hole at the position corresponding to the through hole on the main piston rod, so that one end of the auxiliary piston rod passes through the through hole. The hole protrudes, and the second limit block is connected with one end of the auxiliary piston rod away from the cylinder; the piston assembly can make the auxiliary piston rod slide in the main piston rod. 2 . The dual-piston hydraulic oil cylinder according to claim 1 , wherein the piston assembly comprises a first piston, a second piston and a spring, and the first piston and the main piston rod are arranged at one end of the cylinder. 3 . One end of the secondary piston rod disposed in the cylinder penetrates the first piston and then connects with the second piston; one end of the spring is connected to the first piston, and the other end is connected to the second piston. 3. The dual-piston hydraulic cylinder according to claim 2, wherein the piston assembly further comprises a first limit post and a second limit post, the first limit post and the second limit post are both It is a cylindrical through-hole structure, the first limiting column is coaxially sleeved on the outside of the second limiting column, and the inner hole diameter of the first limiting column and the outer diameter of the second limiting column are matched; The axially retracted lengths of the limit post and the second limit post are smaller than the lengths in the initial state of the spring; the ends of the first limit post and the second limit post away from each other are respectively connected to the first piston and the second piston Fixed connection and coaxial with the cylinder. 4 . The dual-piston hydraulic cylinder according to claim 3 , wherein the springs are evenly distributed in the cylinder body radially around the cylinder axis. 5 .

Images