Hydraulic oil cylinder with limiting function

Abstract

The hydraulic oil cylinder comprises a base body and a plunger rod, a first cavity is formed in the base body, an opening is formed in the front end face of the first cavity, the plunger rod is arranged in the base body in a sliding and penetrating mode, the first cavity is divided into a first oil cavity and a second oil cavity by the plunger rod, the first oil cavity is closer to the bottom of the cavity, and the second oil cavity is closer to the bottom of the cavity. A speed reduction valve is arranged at the front end of the outer side face of the base body, a second cavity is formed in the speed reduction valve, a first oil port is formed in the upper end face of the speed reduction valve, a second oil port is formed in the rear end face of the speed reduction valve, a guide hole is formed in the front end face of the speed reduction valve, and the first oil port, the second oil port and the guide hole are all communicated with the second cavity. A third oil hole connected with the first oil cavity is formed in the lower end of the outer side wall of the seat body, a speed limiting rod is arranged in the guide hole, the first oil port is connected with a hydraulic oil source, the second oil port is connected with the third oil port through an oil pipe, and a limiting arm is arranged on the outer side wall of the plunger rod and used for impacting the guide rod.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hydraulic cylinder with limiting. BACKGROUND

[0002] Hydraulic cylinder is the hydraulic energy conversion into mechanical energy, do linear reciprocating motion (or swing motion) hydraulic actuator. It is simple in structure, reliable in operation. When it is used to realize reciprocating motion, the speed reducer can be dispensed with, and there is no transmission gap, and the movement is stable, so it is widely used in various mechanical hydraulic systems. The output force of hydraulic cylinder and the effective area of piston are proportional to the pressure difference on both sides; the hydraulic cylinder is basically composed of cylinder and cylinder cover, piston and piston rod, sealing device, buffer device and exhaust device. The buffer device and exhaust device are determined according to the specific application, and the other devices are essential.

[0003] The common ordinary hydraulic cylinder realizes the extension and retraction of the piston rod by the in and out of hydraulic oil liquid when working. In actual use, the extension and retraction speed of the piston rod of the oil cylinder will be affected by its bearing capacity, and the speed cannot be reduced in advance when the piston rod is retracted to the position close to the limit, which will cause damage to the oil cylinder when the retraction speed is too fast. And the sudden drop of the ordinary oil cylinder when the flow is too large may cause damage to the system, causing unnecessary loss. UTILITY MODEL CONTENTS

[0004] The utility model aims at solving the above technical problems, and provides a hydraulic cylinder with limiting.

[0005] A hydraulic cylinder with limiting, comprising a seat body and a plunger rod, a first chamber is arranged in the seat body, an opening is arranged on the front end face of the seat body, the plunger rod is slidably arranged in the seat body, the first chamber is divided into a first oil chamber and a second oil chamber by the plunger rod, the first oil chamber is closer to the bottom of the chamber, and the second oil chamber is closer to the opening of the seat body,

[0006] The front end of the outer side of the seat body is provided with a speed reduction valve, a second chamber is arranged in the speed reduction valve, a first oil port is arranged on the upper end face of the speed reduction valve, a second oil port is arranged on the rear end face of the speed reduction valve, a guide hole is arranged on the front end face of the speed reduction valve, the first oil port, the second oil port and the guide hole are communicated with the second chamber, a third oil hole connected with the first oil chamber is arranged on the lower end of the outer side wall of the seat body, a speed limiting rod is arranged in the guide hole, the first oil port is connected with a hydraulic oil source, the second oil port and the third oil port are connected through an oil pipe, a limiting arm is arranged on the outer side wall of the plunger rod, and the limiting arm is used for impacting the guide rod.

[0007] Further, the oil pipe is of L-shaped bending structure.

[0008] Further, the two ends of the oil pipe are connected with the second oil port and the third oil port through welding.

[0009] Further, the guide hole is internally provided with a mounting seat, one side end face of the mounting seat is provided with a connecting plate, the connecting plate is connected with the speed reducing valve through bolt fixing, the mounting seat is provided with a through hole connected with the second chamber, and the speed limiting rod is slidably arranged in the through hole.

[0010] Further, one end of the limiting arm is provided with a connecting sleeve, and the connecting sleeve is fixedly sleeved on the outer side wall of the plunger rod.

[0011] Further, the connecting sleeve comprises two arc-shaped pieces, one end of the two arc-shaped pieces is rotationally connected through a rotating shaft, and the other end of the two arc-shaped pieces is provided with a connecting lug.

[0012] Further, the seat body comprises a body and an end cover, the body is a coverless structure, a through hole for the plunger rod to pass through is formed in the surface of the end cover, and the end cover is shrink-fitted at the port of the body.

[0013] Further, a sealing ring is arranged between the outer side wall of the end cover and the inner side wall of the seat body.

[0014] Further, the plunger rod comprises a rod body and a piston, a stepped structure is arranged on the outer side wall of the lower segment of the rod body, the piston is sleeved on the stepped structure, the inner side wall of the piston is connected with the outer side wall of the stepped structure, and the piston is locked through a nut below.

[0015] Beneficial effects: compared with the prior art, the speed reducing valve is additionally arranged at the oil inlet of the hydraulic oil cylinder, and the limiting device is additionally arranged on the oil cylinder piston rod. When the hydraulic oil cylinder piston rod is retracted, the speed reducing valve rod is arranged on the piston rod, the oil port position flow gradually decreases under the action of the speed reducing valve, the retraction speed of the hydraulic oil cylinder piston rod is reduced, the oil cylinder is protected, and the system damage caused by the sudden drop of the oil cylinder is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a front view of a hydraulic oil cylinder with a limiting device.

[0017] Figure 2 It is a top view of a hydraulic oil cylinder with a limiting device.

[0018] Figure 3 It is an internal schematic view of a speed reducing valve.

[0019] Figure 4 It is a schematic view of a limiting arm.

[0020] In the drawings, 1 is a seat body, 2 is a third oil port, 3 is an oil pipe, 4 is a second oil port, 5 is a first oil port, 6 is a speed reducing valve, 7 is a guide rod, 8 is a limiting arm, 9 is a plunger rod, 10 is a first oil chamber, 11 is a second oil chamber, 12 is a mounting seat, and 13 is a connecting sleeve. DETAILED DESCRIPTION

[0021] In order to deepen the understanding of the utility model, the utility model will be further described in the following in conjunction with embodiments and drawings, and the embodiments are only used to explain the utility model and do not constitute the limitation to the protection scope of the utility model.

[0022] As Figures 1-4 shown, seat body 1, third oil port 2, oil pipe 3, second oil port 4, first oil port 5, speed reducing valve 6, guide rod 7, limit arm 8, plunger rod 9, first oil cavity 10, second oil cavity 11, mounting seat 12, connecting sleeve 13;

[0023] A hydraulic cylinder with a limit, comprising seat body 1, plunger rod 9, the first chamber is arranged in seat body 1, the front end face is provided with an opening, the plunger rod 9 is slidably arranged in seat body 1, the first chamber is divided into first oil cavity 10 and second oil cavity 11 by plunger rod 9, the first oil cavity 10 is closer to the bottom of the chamber, the second oil cavity 11 is closer to the opening of seat body 1,

[0024] The front end of the outer side of seat body 1 is provided with speed reducing valve 6, the second chamber is arranged in speed reducing valve 6, the upper end face of speed reducing valve 6 is provided with first oil port 5, the rear end face of speed reducing valve 6 is provided with second oil port 4, the front end face of speed reducing valve 6 is provided with guide hole, the first oil port 5, the second oil port 4 and the guide hole are communicated with the second chamber, the lower end of the outer side wall of seat body 1 is provided with third oil hole connected with the first oil cavity 10, the speed limiting rod is arranged in the guide hole, the first oil port 5 is connected with the hydraulic oil source, the second oil port 4 and the third oil port 2 are connected through oil pipe 3, the outer side wall of plunger rod 9 is provided with limit arm 8, the limit arm 8 is used for impacting guide rod 7.

[0025] In the embodiment, the oil pipe 3 is L-shaped bending structure.

[0026] In the embodiment, the two ends of oil pipe 3 are connected with second oil port 4 and third oil port 2 through welding.

[0027] In the embodiment, the mounting seat 12 is arranged in the guide hole, the connecting plate is arranged on one side end face of mounting seat 12, the connecting plate is connected with speed reducing valve 6 through bolt fixing, the through hole connected with the second chamber is arranged on mounting seat 12, and the speed limiting rod is slidably arranged in the through hole.

[0028] In the embodiment, one end of limit arm 8 is provided with connecting sleeve 13, and connecting sleeve 13 is fixedly sleeved on the outer side wall of plunger rod 9.

[0029] In the embodiment, the connecting sleeve 13 comprises two arc-shaped pieces, one end of the two arc-shaped pieces is rotationally connected through a rotating shaft, and the other end of the two arc-shaped pieces is provided with a connecting lug, and the two connecting lugs are fixedly connected through a bolt and a nut.

[0030] In the present embodiment, the seat body 1 comprises a body and an end cover, the body is a coverless structure, the end cover is provided with a through hole for the plunger rod 9 to pass through, and the end cover is shrink-fitted at the port of the body

[0031] In the present embodiment, a sealing ring is arranged between the outer side wall of the end cover and the inner side wall of the seat body 1.

[0032] In the present embodiment, the plunger rod 9 comprises a rod body and a piston, the lower section of the rod body is provided with a stepped structure, the piston is sleeved on the stepped structure, the inner side wall of the piston is connected with the outer side wall of the stepped structure, and the piston is locked by a nut from below.

[0033] Working principle: when the oil cylinder works, when the plunger rod 9 of the oil cylinder is retracted, the volume of the first oil cavity 10 is reduced, the oil flows into the speed reducing valve 6 from the first oil port 5 through the oil pipe 3, when the plunger rod 9 of the oil cylinder is retracted to the proximity of the limit position, the limit arm 8 installed thereon will collide with the speed limiting rod and apply pressure to the speed limiting rod, so that the speed limiting rod moves towards the first oil port 5 and blocks part of the oil port, and with the movement of the limit rod, the effective area of the oil port becomes smaller and smaller, so that the oil amount between the oil ports gradually decreases, and then the retraction speed of the plunger rod 9 of the oil cylinder gradually slows down, avoiding damage to the oil cylinder caused by too fast retraction speed.

[0034] When the plunger rod of the oil cylinder is extended, the volume of the first oil cavity 10 is increased, the oil is sucked into the oil cylinder through the oil pipe 3, the pressure applied by the limit arm 8 to the speed limiting rod is lost, at this time, the oil flowing through the oil inlet will gradually push out the valve rod, so that the speed reducing valve 6 is gradually opened, the flow between the oil port and the oil pipe 3 is gradually increased, so that the extension speed of the plunger rod 9 of the oil cylinder gradually increases, avoiding damage to the system caused by sudden extension and retraction of the oil cylinder.

[0035] The above only describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hydraulic cylinder with a limit, characterized in that, The application relates to a hydraulic oil tank, which comprises a seat body, a plunger rod, a first chamber arranged in the seat body, an opening arranged on the front end surface of the first chamber, the plunger rod slidingly arranged in the seat body, the first chamber being divided into a first oil chamber and a second oil chamber by the plunger rod, the first oil chamber being closer to the bottom of the chamber, the second oil chamber being closer to the opening of the seat body, a speed reduction valve arranged on the front end of the outer side of the seat body, a second chamber arranged in the speed reduction valve, a first oil port arranged on the upper end surface of the speed reduction valve, a second oil port arranged on the rear end surface of the speed reduction valve, a guide hole arranged on the front end surface of the speed reduction valve, the first oil port, the second oil port and the guide hole being communicated with the second chamber, a third oil hole arranged on the lower end of the outer side wall of the seat body and connected with the first oil chamber, a speed limiting rod arranged in the guide hole, the first oil port being connected with a hydraulic oil source, the second oil port being connected with the third oil hole through an oil pipe, a limiting arm arranged on the outer side wall of the plunger rod, and the limiting arm being used for impacting the guide rod.

2. The hydraulic cylinder with a stop according to claim 1, characterized in that The oil pipe is of an L-shaped bending structure.

3. The hydraulic cylinder with a stop according to claim 1, characterized in that, The two ends of the oil pipe are connected with the second oil port and the third oil port through welding.

4. The hydraulic cylinder with a stop according to claim 1, characterized in that, A mounting seat is arranged in the guide hole, a connecting plate is arranged on one side end surface of the mounting seat, the connecting plate is connected with the speed reduction valve through bolt fixing, a through hole connected with the second chamber is arranged on the mounting seat, and the speed limiting rod slidingly passes through the through hole.

5. The hydraulic cylinder with a stop according to claim 1, characterized in that, One end of the limiting arm is provided with a connecting sleeve, and the connecting sleeve is fixedly sleeved on the outer side wall of the plunger rod.

6. The hydraulic cylinder with a stop according to claim 5, characterized in that The connecting sleeve comprises two arc-shaped pieces, one end of the two arc-shaped pieces is rotationally connected through a rotating shaft, the other end of the two arc-shaped pieces is provided with a connecting lug, and the two connecting lugs are fixedly connected through a bolt and a nut.

7. The hydraulic cylinder with a stop according to claim 1, characterized in that, The seat body comprises a body and an end cover, the body is a cover-free structure, a through hole for the plunger rod to pass through is arranged on the surface of the end cover, and the end cover is interference-connected at the port of the body.

8. The hydraulic cylinder with a stop according to claim 7, characterized in that, A sealing ring is arranged between the outer side wall of the end cover and the inner side wall of the seat body.

9. The hydraulic cylinder with a stop according to claim 1, characterized in that, The plunger rod comprises a rod body and a piston, a stepped structure is arranged on the outer side wall of the lower section of the rod body, the piston is sleeved on the stepped structure, the inner side wall of the piston is connected with the outer side wall of the stepped structure, and the piston is locked through a nut below.

Images