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A speed-changing double-piston series hydraulic cylinder

A technology of series hydraulic cylinders and speed conversion, applied in the field of hydraulic cylinders, can solve the problems of complex structure, difficult maintenance and high cost of variable pumps, and achieve the effects of simplifying structure and control, reducing machining accuracy and saving energy.

Inactive Publication Date: 2015-10-21
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of the variable variable pump is complicated, the cost is high, the failure rate is high, and the maintenance is difficult, which increases the price of the whole hydraulic equipment.

Method used

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  • A speed-changing double-piston series hydraulic cylinder
  • A speed-changing double-piston series hydraulic cylinder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A speed conversion double-piston series hydraulic cylinder. Such as figure 1 As shown, the hydraulic cylinder includes a large end cover 2, a guide sleeve 4, a cylinder body 24, a large piston 6, a large piston rod 25, a small piston 11, a small piston rod 26, a small end cover 14 and a quick shut-off valve 19.

[0029] Such as figure 1 As shown, the cylinder 24 is a whole composed of the large cylinder 5 and the small cylinder 13. The end of the large cylinder body 5 is fixedly equipped with a large end cover 2, the end of the small cylinder body 13 is fixedly equipped with a small end cover 14, and the guide sleeve 4 is fixed in the large cylinder body 5 concentrically against the large end cover 2. The large cylinder 5 has a first oil port 22 which is close to the guide sleeve 4; the small cylinder 13 has a second oil port 15 which is close to the small end cover 14. Four triangular grooves 9 are symmetrically opened at the junction of the inner wall of the large cylin...

Embodiment 2

[0038] A speed conversion double-piston series hydraulic cylinder. This embodiment is the same as embodiment 1 except for the following technical parameters:

[0039] The axial length H of the triangular groove 9 is 7-8mm, the radial length L of the triangular groove 9 is 5-6mm; the projections of the triangular groove 9 on the horizontal plane and the vertical plane are both isosceles triangles, and the triangular groove 9 is on the horizontal plane. The projected isosceles included angle is 60-75°, and the vertical plane is a plane perpendicular to the radial direction of the triangular groove 9.

[0040] The groove width of the pressure equalizing groove 12 is 0.6 to 0.8 mm, and the groove depth is 0.8 to 1.0 mm.

[0041] The working process of this specific implementation:

[0042] When the hydraulic oil enters the rod cavity 23 of the large piston rod from the first oil port 22, the large piston 6 moves inward to the bottom of the large cylinder 5. The ejector rod of the valve c...

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Abstract

The invention particularly relates to a variable speed double-piston series-connection hydraulic cylinder. According to the technical scheme, the end of a large piston rod (25) extends out of a guide sleeve (4) and a large end cap (2), the other side of a large piston (6) is concentrically provided with a small piston hole, the aperture of the small piston hole is equal to the outer diameter of a small piston (11), the depth of the small piston hole is equal to the thickness of the small piston (11), the large piston (6) and the large piston rod (25) are concentrically provided with small piston rod through holes, and a small piston rod (26) penetrates through the small piston rod through holes. The side face of the large piston (6) on the same side with the small piston holes is provided with a valve base hole, the hole wall of the valve base hole is sequentially provided with a first annular oil groove (28) and a second annular oil groove (35) from inside to outside, the first annular oil groove (28) is communicated with a rod cavity (23) of the large piston rod through a first oil channel (20), the second annular oil groove (35) is communicated with the small piston hole of the large piston (6) through a second oil channel (18), and a quick stop valve (19) is fixed to the inside of the valve base hole. The variable speed double-piston series hydraulic cylinder has the advantages of being simple in switch, saving energy, lowering cost, and being convenient to maintain and stable in switch process.

Description

technical field [0001] The invention belongs to the technical field of hydraulic cylinders. It specifically relates to a speed-changing double-piston serial hydraulic cylinder. Background technique [0002] At present, in hydraulic equipment, the speed of hydraulic components such as hydraulic cylinders and hydraulic motors is one of the important working performances of the hydraulic system. The mouth is used to adjust the flow rate and achieve the purpose of adjusting the speed. However, these throttle valves or speed regulating valves are generally installed on the main oil circuit, bypass oil circuit or return oil circuit of the hydraulic system to form a throttling and speed regulating system. No matter where it is installed, the hydraulic oil will have pressure loss through the throttle valve. , this loss will be converted into heat energy, increasing the temperature of the hydraulic oil. If the oil temperature is too high, the hydraulic oil will deteriorate, reduce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F15B15/17
Inventor 湛从昌陈奎生龚云蒋俊陈新元吴凛
Owner WUHAN UNIV OF SCI & TECH
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