Press fitting device for piston rod of oil cylinder

Abstract

The utility model relates to the technical field of oil cylinder assembly, in particular to an oil cylinder piston rod press fitting device which comprises a top plate, a sliding plate, a fixed plate and a bottom plate which are sequentially arranged from top to bottom, two guide columns which are arranged side by side at intervals are fixedly connected between the top plate and the bottom plate, and a telescopic cylinder and a vertical supporting plate are arranged between the upper ends and the lower ends of the two guide columns respectively. The two ends of the sliding plate slidably sleeve the two guide columns, the two ends of the telescopic cylinder are fixed to the top plate and the sliding plate respectively, and the center of the lower plate face of the sliding plate is connected with a pressing head corresponding to the rod end of the piston rod. The fixing plate is a U-shaped plate with the two ends fixed to column bodies of the two guide columns, the middle plate face of the fixing plate is connected with a clamping plate, and the end, corresponding to a U-shaped opening of the fixing plate, of the clamping plate is provided with an arc-shaped clamping opening for clamping an oil cylinder body in a matched mode. The column body of the guide column between the fixed plate and the sliding plate is sleeved with a spring, and the plate body of the vertical supporting plate is connected with a pin shaft which is adaptively inserted into an oil cylinder base reaming hole; according to the oil cylinder piston rod press-fitting device, press-fitting efficiency can be improved, and meanwhile press-fitting abrasion is avoided.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder assembly technology, and in particular to a hydraulic cylinder piston rod press-fitting device. Background Technology

[0002] As is well known, pressing the piston rod into the cylinder body during the hydraulic cylinder assembly process is a relatively simple but extremely careful step. Before the cylinder head is sealed, there is no limit to the piston rod's position. To ensure the cylinder's sealing performance and long-term stability, strong friction with the cylinder's inner wall or seals must be avoided during piston rod insertion. Therefore, precise control is required for pressing speed, force, and the alignment of the piston rod with the cylinder body. Traditional manual pressing is no longer sufficient for producing high-performance hydraulic cylinders. Chinese invention patent CN103707056A discloses a piston rod assembly machine that uses linear guides to ensure the alignment of the piston rod during pressing. However, because it is a horizontally mounted machine, installation is complex and unsuitable for assembling cylinders requiring pre-negative pressure injection. Furthermore, the seals are affected by gravity, leading to uneven force distribution during horizontal pushing. Additionally, the guide rail slider is prone to shifting during movement, significantly increasing the wear probability of the seals and the cylinder's inner wall, easily causing pressing failure. Utility Model Content

[0003] In order to overcome the shortcomings of the prior art and solve the existing technical problems, this utility model discloses a hydraulic cylinder piston rod pressing device, which can improve pressing efficiency while avoiding pressing wear.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A hydraulic cylinder piston rod pressing device includes a top plate, a sliding plate, a fixed plate, and a bottom plate arranged sequentially from top to bottom with corresponding plate surfaces. Two guide columns spaced apart and fixed between the top plate and the bottom plate are connected and fixed. A telescopic cylinder and a vertical support plate are respectively provided between the upper and lower ends of the two guide columns. The two ends of the sliding plate are slidably sleeved on the two guide columns. The two ends of the telescopic cylinder are respectively fixed to the top plate and the sliding plate. A pressure head corresponding to the piston rod end is connected to the center of the lower plate surface of the sliding plate. The fixed plate is a U-shaped plate with both ends fixed to the column bodies of the two guide columns. A clamping plate is connected to the middle plate surface of the fixed plate. One end of the clamping plate corresponding to the U-shaped opening of the fixed plate is provided with an arc-shaped clamping slot adapted to clamp the cylinder body of the hydraulic cylinder. A spring is sleeved on the column body of the guide column between the fixed plate and the sliding plate. A pin adapted to be inserted into the hinge hole of the hydraulic cylinder base is connected to the plate body of the vertical support plate.

[0006] Furthermore, the fixing plate can be moved and positioned along the guide post, and the pressure head, clamping plate, and pin are all detachable.

[0007] Furthermore, a pressure sensor is connected between the pressure head and the sliding plate.

[0008] Furthermore, a magnet is embedded in the center of the arc-shaped opening of the card plate.

[0009] Furthermore, the pressure head is made of PTFE, and the lower end of the pressure head is provided with a slot for inserting the piston rod end.

[0010] Furthermore, each guide post and the base plate are connected by a support foot block, and the upright plate is fixed between two upright foot blocks.

[0011] By adopting the technical solution described above, this utility model has the following beneficial effects:

[0012] The hydraulic cylinder piston rod pressing device disclosed in this utility model adopts a vertical pressing method, which can ensure the alignment of the piston rod and the cylinder body, as well as the pressure balance of the sealing components. It is convenient to control the pressing pressure. The cylinder body positioning only requires fitting the hydraulic cylinder base hinge hole onto the corresponding pin and clamping the cylinder body onto the clamping plate, making installation very convenient. The spring can press the sliding plate tightly during the pressing process to prevent movement and play a certain buffering and limiting role, thereby avoiding press wear as a whole and improving the assembly efficiency and success rate. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the implementation structure of this utility model.

[0014] In the diagram: 1. Top plate; 2. Guide column; 3. Sliding plate; 4. Pressure head; 5. Clamping plate; 6. Magnet; 7. Support plate; 8. Support foot block; 9. Base plate; 10. Pin; 11. Fixing plate; 12. Spring; 13. Pressure sensor; 14. Telescopic cylinder. Detailed Implementation

[0015] The technical solution of this utility model will now be described with reference to the accompanying drawings of the embodiments of this utility model. In the description, it should be understood that the terms "upper," "lower," "front," "rear," "left," and "right," etc., indicating directions or positional relationships, are only used to correspond to the accompanying drawings of this utility model for ease of description, and do not indicate or imply that the device or element referred to must have a specific orientation.

[0016] Combined with appendix Figure 1The hydraulic cylinder piston rod pressing device includes a top plate 1, a sliding plate 3, a fixed plate 11, and a bottom plate 9 arranged sequentially from top to bottom and corresponding to each other. Two guide columns 2 are fixedly connected between the top plate 1 and the bottom plate 9. A telescopic cylinder 14 and a vertical support plate 7 are respectively provided between the upper and lower ends of the two guide columns 2. The telescopic cylinder 14 and the guide column 2 are coaxial. As needed, a support foot block 8 is connected between each guide column 2 and the bottom plate 9. The vertical support plate 7 is fixed between the two vertical support foot blocks 8. By increasing the support foot blocks 8, the support strength and stability of the bottom plate 9 are improved, while the length of the guide column 2 can be reduced, saving the processing and material costs of the guide column 2.

[0017] The two ends of the sliding plate 3 are slidably sleeved on the two guide posts 2. Specifically, through holes are opened at the ends of the sliding plate 3 to accommodate the sliding passage of the corresponding guide posts 2. The two ends of the telescopic cylinder 14 are fixed to the top plate 1 and the sliding plate 3, respectively. The telescopic cylinder can be an electric cylinder or a pneumatic cylinder. Generally, the cylinder body of the telescopic cylinder 14 is fixed to the center of the upper surface of the sliding plate 3 to ensure pressure balance and switch the pressing mode. It can either rely on the rod end of the telescopic cylinder 14 to abut against the top plate 1 to control the downward pressure, or rely on the gravity of the sliding plate 3, the cylinder body of the telescopic cylinder 14, and the piston rod to press down. A corresponding piston rod is connected to the center of the lower surface of the sliding plate 3. The rod end has a pressure head 4; as needed, a pressure sensor 13 is connected between the pressure head 4 and the sliding plate 3. Through pressure feedback, it is easy to control the downward pressure and check whether there is a momentary strong friction based on pressure fluctuations; in addition, the pressure head 4 is made of PTFE, and the lower end of the pressure head 4 has a slot for inserting the piston rod end, which avoids damage to the piston rod and ensures the alignment of the piston rod; the guide post 2 between the fixed plate 11 and the sliding plate 3 is fitted with a spring 12. The spring 12 can press against the sliding plate 3 during the downward pressing process to prevent movement and play a certain role in buffering and limiting;

[0018] The fixing plate 11 is a U-shaped plate with both ends fixed to the two guide pillars 2. The middle plate surface of the fixing plate 11 is connected to a clamping plate 5. The clamping plate 5 is provided with an arc-shaped clamping slot at one end of the U-shaped opening of the fixing plate 11 to fit the cylinder body, so as to ensure convenient clamping and to use the clamping plate 5 to radially position the cylinder. If necessary, a magnet 6 is embedded in the center of the arc surface of the clamping slot of the clamping plate 5. The cylinder body is attracted by the magnet 6 to prevent the cylinder from jamming the clamping plate 5. The support plate 7 is connected to a pin 10 that fits to be inserted into the hinge hole of the cylinder base, so as to ensure convenient insertion and to use the pin 10 to position the cylinder circumferentially and axially.

[0019] As needed, the fixing plate 11 can be moved and adjusted along the guide post 2 for positioning. Specifically, an adjustment hole is set at the end of the fixing plate to allow the guide post 2 to slide through. Then, a threaded hole is opened in the wall of the adjustment hole, and a screw is screwed into the outer end of the threaded hole to abut against the guide post 2 for positioning. When adjusting the fixing plate 1, simply loosen the screw and slide the fixing plate 1 up and down. Alternatively, screws can be arranged around the guide post 2 on the top surface of the support block 8. The fixing plate 11 is provided with a smooth hole through which the upper end of the screw passes. Then, nuts are screwed into the screws at both ends of the smooth hole to tighten the fixing plate 11 for positioning. When adjusting, loosen the nuts, adjust the fixing plate 1, and then tighten the nuts. The pressure head 4, the clamping plate 5, and the pin 10 are all detachable. That is, the pressure head 4 and the sliding plate 3, as well as the pin 11 and the support plate 7 are all connected by threads. The clamping plate 5 can be installed on the fixing plate 11 by bolt assembly. This is mainly to facilitate the replacement of the corresponding clamping and positioning accessories after disassembly and assembly when pressing different specifications of hydraulic cylinder piston rods.

[0020] To implement the hydraulic cylinder piston rod pressing device described in this utility model, it is only necessary to place the cylinder body into the piston cylinder without a cover, insert the pin 10 into the base hinge hole, and simultaneously insert the cylinder body into the arc-shaped slot of the clamping plate 5. This will control the extension of the telescopic cylinder 14, which will drive the sliding plate 3 and the pressing head 4 to press down. After aligning with and contacting the piston rod, the cylinder body will be slowly and evenly pressed into the hydraulic cylinder.

[0021] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims in this utility model, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. A hydraulic cylinder piston rod press-fitting device, characterized in that: The system comprises a top plate (1), a sliding plate (3), a fixed plate (11), and a bottom plate (9) arranged sequentially from top to bottom and corresponding to each other. Two spaced, parallel guide posts (2) are fixedly connected between the top plate (1) and the bottom plate (9). Telescopic cylinders (14) and support plates (7) are respectively provided between the upper and lower ends of the two guide posts (2). The two ends of the sliding plate (3) are slidably fitted onto the two guide posts (2). The two ends of the telescopic cylinders (14) are respectively fixed to the top plate (1) and the sliding plate (3). The lower surface of the sliding plate (3)... The center is connected to the pressure head (4) corresponding to the piston rod end; the fixed plate (11) is a U-shaped plate with both ends fixed to the two guide posts (2) and the middle plate surface of the fixed plate (11) is connected to the clamping plate (5). The clamping plate (5) is provided with an arc-shaped clamping mouth that is adapted to clamp the cylinder body of the oil cylinder at one end of the U-shaped opening of the fixed plate (11); the guide post (2) between the fixed plate (11) and the sliding plate (3) is fitted with a spring (12), and the plate body of the support plate (7) is connected to a pin (10) adapted to be inserted into the hinge hole of the oil cylinder base.

2. The hydraulic cylinder piston rod pressing device according to claim 1, characterized in that: The fixing plate (11) can be moved and positioned along the guide post (2), and the pressure head (4), the clamping plate (5) and the pin (10) are all detachable.

3. The hydraulic cylinder piston rod pressing device according to claim 1, characterized in that: A pressure sensor (13) is connected between the pressure head (4) and the sliding plate (3).

4. The hydraulic cylinder piston rod pressing device according to claim 1, characterized in that: A magnet (6) is embedded in the center of the arc-shaped opening of the card plate (5).

5. The hydraulic cylinder piston rod pressing device according to claim 1, characterized in that: The pressure head (4) is made of PTFE, and the lower end of the pressure head (4) is provided with a slot for inserting the piston rod end.

6. The hydraulic cylinder piston rod pressing device according to claim 1, characterized in that: Each guide post (2) and the base plate (9) are connected by a support foot block (8), and the upright plate (7) is fixed between the two upright foot blocks (8).

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