CN203879846U

CN203879846U - Spring type front buffering structure for hydraulic cylinder

Info

Publication number: CN203879846U
Application number: CN201420238341.8U
Authority: CN
Inventors: 王建中; 刘兵; 赵斌; 张希杰; 尚志颉
Original assignee: TIANJIN URANUS HYDRAULIC MACHINERY CO Ltd
Current assignee: TIANJIN URANUS HYDRAULIC MACHINERY CO Ltd
Priority date: 2014-05-12
Filing date: 2014-05-12
Publication date: 2014-10-15
Anticipated expiration: 2024-05-12

Abstract

The utility model discloses a spring type front buffering structure for a hydraulic cylinder. The spring type front buffering structure comprises a piston and a piston rod which are arranged in a cylinder barrel. The piston rod is sleeved by a buffering pad, a spring is arranged between the piston and the buffering pad, and an end face, in contact with a cylinder head at one end of the cylinder barrel, of the buffering pad is a conical face. The spring type front buffering structure has the advantages that the buffering pad and the cylinder head are just in contact to avoid relative slide friction, so that no scrap iron is not ground out; due to the fact that the requirement for part accuracy is low, normal work can be guaranteed in the situation when the coaxiality is low after assembling; meanwhile, a one-way valve structure is removed to reduce cost.

Description

Buffer structure before oil hydraulic cylinder spring

Technical field

The utility model belongs to machinery manufacturing technology field, relates to the front buffer structure of a kind of oil hydraulic cylinder spring.

Background technique

Fig. 1 be prior art oil hydraulic cylinder before the structural representation of buffer structure.As shown in Figure 1, in metallurgical oil hydraulic cylinder series product, front buffering is all the structural type of plunger, between piston 5 and piston rod 2, buffer plunger 3 is set, and controls flow and reaches the effect of buffering, and be provided with one-way valve at cylinder head position by buffer gap.The buffer length of this front buffer structure is generally 20-80mm.If it is even longer that buffer length requires to reach 150mm, adopt this traditional piston structure form, just there is following subject matter:

First, because buffer length is long, buffer plunger 3 lengthens with cylinder head 1 Spielpassung, thereby requirement on machining accuracy increases substantially, after assembling, buffer plunger 3 with the coaxality of cylinder head 1 slightly error will grind out iron filings, bring fatal problem to oil hydraulic cylinder, cause Sealing to damage, even cylinder barrel 4 damages.

Second, because buffer length is long, buffer plunger 3 need to put in cylinder head 1 completely, therefore cylinder head need to be more a lot of than lengthening under normal circumstances, the lengthening of cylinder head has not only caused the waste on material, and in limited space range, can only reduce the lengthening that guiding is changed cylinder head, the minimizing of guiding must cause reducing of oil hydraulic cylinder working life.

Summary of the invention

The utility model, for above-mentioned problems of the prior art, provides a kind of oil hydraulic cylinder spring front buffer structure.

The utility model for addressing this problem taked technological scheme is:

Buffer structure before oil hydraulic cylinder spring of the present utility model, comprises the piston and the piston rod that are arranged in cylinder barrel, and upper cover of piston rod is connected to cushion pad, between piston and cushion pad, is provided with spring.

The end face that described cushion pad contacts with the cylinder head that is connected to cylinder barrel one end is the conical surface.

Advantage of the present utility model and good effect are:

Buffer structure before oil hydraulic cylinder spring of the present utility model, cushion pad just contacts with cylinder head, there is no relative sliding friction, can not grind out iron filings; Low to element precision requirement, the in the situation that after assembling, coaxality being not too high, also can normally work; Meanwhile, save one-way valve structures, reduced cost.

Brief description of the drawings

Fig. 1 be prior art oil hydraulic cylinder before the structural representation of buffer structure;

Fig. 2 is the structural representation of buffer structure before oil hydraulic cylinder spring of the present utility model;

Fig. 3 is that before oil hydraulic cylinder spring of the present utility model, buffer structure removes the stereogram after cylinder barrel;

Critical piece label declaration in figure:

1: cylinder head 2: piston rod

3: buffer plunger 4: cylinder barrel

5: piston d: buffer length

6: piston rod 7: cushion pad

8: cylinder barrel 9: spring

10: piston.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is described further, in accompanying drawing, parts same as the prior art have adopted identical label.Following each embodiment is only not limitation of the utility model for the utility model is described.

Fig. 2 is the structural representation of buffer structure before oil hydraulic cylinder spring of the present utility model; Fig. 3 is that before oil hydraulic cylinder spring of the present utility model, buffer structure removes the stereogram after cylinder barrel.As shown in Figures 2 and 3, buffer structure before oil hydraulic cylinder spring of the present utility model, comprises the piston 10 and the piston rod 6 that are arranged in cylinder barrel 8, is socketed with cushion pad 7 on piston rod 6, between piston 10 and cushion pad 7, is provided with spring 9.The diameter of cylinder barrel 8 is 180mm, and the diameter of piston rod 6 is 125mm, and buffer length is 150mm.When piston rod 6 enters buffer position, cushion pad 7 contacts with the cylinder head that is connected to cylinder barrel 8 one end.The end face that cushion pad 7 contacts with cylinder head is the conical surface.

Before oil hydraulic cylinder spring of the present utility model, the working principle of buffer structure is as follows:

In the time that piston rod reaches the position that needs buffering, the conical surface of cushion pad contacts with cylinder head, seal the drainback passage of rod chamber, make hydraulic oil be subject to certain resistance oil sump tank by narrow and small adjusting valve opening, thereby the motion speed that has reduced piston rod plays the effect of buffering.Because cushion pad just contacts with cylinder head, there is no relative sliding friction, can not grind out iron filings.Piston more approaches cylinder head, and amount of spring compression is larger, and the effect of shutoff drainback passage is better.In the time of piston rod reversing motion, spring is strengthened compression under oil pressure effect, and cushion pad cylinder head occurs that large gap oil pressure oil enters rod chamber, increases oil pressure lifting surface area, ensures that piston rod can start rapidly.This structure requires low to element precision, the in the situation that after assembling, coaxality being not too high, also can normally work, and has reduced cost.

Claims

1. buffer structure before an oil hydraulic cylinder spring, comprise the piston (10) and the piston rod (6) that are arranged in cylinder barrel (8), it is characterized in that: on piston rod (6), be socketed with cushion pad (7), between piston (10) and cushion pad (7), be provided with spring (9).

2. buffer structure before oil hydraulic cylinder spring according to claim 1, is characterized in that: cushion pad (7) is the conical surface with the end face that the cylinder head that is connected to cylinder barrel (8) one end contacts.