阅读说明：本技术 一种组合机床动力滑台液压系统 (Power sliding table hydraulic system of combined machine tool ) 是由 蔺国民 于 2020-12-31 设计创作，主要内容包括：一种组合机床动力滑台液压系统,采用活塞杆固定的单杆活塞缸,缸筒外侧沿轴向固定有速度控制条,速度控制条各段的高度控制工作速度的大小,长度控制工作速度的持续时间；当单杆活塞缸缸筒伸出时,其上的速度控制条下压行程阀的滚轮,改变了行程阀阀口开度,进而控制流向单杆液压缸的液体流量,最终控制了单杆活塞缸的运动速度；行程阀为二位二通机动阀,其出口与单杆活塞缸无杆腔相通,进口与电液换向阀相通；与单杆活塞缸和行程阀配合使用的有卸荷阀、供压单向阀、背压溢流阀、油箱、液压泵、油滤、压力继电器、延时节流阀、继电单向阀等元件；本发明具有结构简单、能耗低、控制精度高等优点。(A power sliding table hydraulic system of a combined machine tool adopts a single-rod piston cylinder with a fixed piston rod, a speed control strip is fixed on the outer side of a cylinder barrel along the axial direction, the height of each section of the speed control strip controls the size of a working speed, and the length controls the duration of the working speed; when the cylinder barrel of the single-rod piston cylinder extends out, the speed control strip on the single-rod piston cylinder presses down the roller of the stroke valve, so that the opening degree of the valve port of the stroke valve is changed, the liquid flow flowing to the single-rod hydraulic cylinder is further controlled, and the movement speed of the single-rod piston cylinder is finally controlled; the stroke valve is a two-position two-way motorized valve, the outlet of the stroke valve is communicated with the rodless cavity of the single-rod piston cylinder, and the inlet of the stroke valve is communicated with the electro-hydraulic reversing valve; the device is matched with a single-rod piston cylinder and a stroke valve for use and comprises elements such as an unloading valve, a pressure supply one-way valve, a back pressure overflow valve, an oil tank, a hydraulic pump, an oil filter, a pressure relay, a time delay throttle valve, a relay one-way valve and the like; the invention has the advantages of simple structure, low energy consumption, high control precision and the like.)

1. The utility model provides a combination machine tool power slip table hydraulic system, includes single-rod piston cylinder (1), its characterized in that: a piston rod of the single-rod piston cylinder (1) is vertically and fixedly connected with a fixed wall (19), a speed control strip (2) is axially fixed on the outer side of a cylinder barrel of the single-rod piston cylinder (1), the height of an AB section on the speed control strip (2) controls the size of a first feeding speed, the length of the AB section controls the duration time of the first feeding speed, the height of a BC section controls the size of a second feeding speed, the length of the BC section controls the duration time of the second feeding speed, when the single-rod piston cylinder (1) extends until a CD section on the speed control strip (2) presses down a roller of the stroke valve (3), the stroke valve (3) is closed, and the single-rod piston cylinder (1) stops moving; the stroke valve (3) is a two-position two-way motorized valve, and a roller at the upper end of the stroke valve tightly supports the speed control strip (2); the stroke valve (3) is connected with the quick-return one-way valve (4) in parallel, an outlet of the stroke valve (3) is communicated with a rodless cavity of the single-rod piston cylinder (1), and an inlet of the stroke valve (3) is connected with a left oil port at the upper part of the electro-hydraulic reversing valve (15) and an outlet of the quick-feed one-way valve (5); the electro-hydraulic directional valve (15) is a three-position five-way electromagnetic hydraulic directional slide valve with an M-shaped middle position function, a right oil port at the upper part of the electro-hydraulic directional valve (15) is communicated with a rod cavity of the single-rod piston cylinder (1), and a left oil port at the lower part of the electro-hydraulic directional valve (15) is connected with the oil tank (10) through a throttling back pressure valve (14); an oil port in the middle of the lower part of the electro-hydraulic directional valve (15) is connected with an outlet of a pressure supply one-way valve (13), an inlet of the pressure supply one-way valve (13) is connected with an oil outlet of a hydraulic pump (12), and an oil inlet of the hydraulic pump (12) is connected with an oil tank (10) through an oil filter (11);

an inlet of the fast-forward check valve (5) and a right oil port at the lower part of the electro-hydraulic reversing valve (15) are connected with an inlet of the external control leakage type unloading valve (8), and an outlet of the external control leakage type unloading valve (8) is connected with an oil tank (10) through a back pressure overflow valve (9);

the positive electrodes of a 1YA coil and a 2YA coil of the electro-hydraulic reversing valve (15) are respectively connected to two binding posts of a pressure relay (18) through leads, the negative electrodes of the 1YA coil and the 2YA coil of the electro-hydraulic reversing valve (15) are connected to the negative electrode of a power supply, a normally open type time delayer (17) is connected in series between the positive electrode of the 2YA coil and the pressure relay (18), and a power supply binding post and the positive electrode of the power supply of the pressure relay (18) are connected to two ends of a power switch (16); the inlet of the stroke valve (3) is communicated with the inlet of the relay one-way valve (6), the outlet of the relay one-way valve (6) is connected to the pressure relay (18), and the relay one-way valve (6) is connected with the delay throttle valve (7) in parallel.

2. The combined machine tool power slide hydraulic system of claim 1, wherein: the height and the length of each section of the speed control strip (2) can be adjusted by replacement.

3. The combined machine tool power slide hydraulic system of claim 1, wherein: the fast forward stroke of the single-rod piston cylinder (1) is adjusted by moving the position of the stroke valve (3) left and right, and the fast forward movement speed is adjusted by moving the position of the stroke valve (3) up and down.

4. The combined machine tool power slide hydraulic system of claim 1, wherein: the single-rod piston cylinder (1) works in a mode of piston rod fixation and cylinder linear motion, and a hydraulic oil inlet path and an oil return path are both arranged inside the piston rod.

Technical Field

The invention relates to the technical field of hydraulic transmission and control, in particular to a power sliding table hydraulic system of a combined machine tool.

Background

The combined machine tool is a special machine tool with higher automation degree, and different cutters are arranged on a power sliding table of the combined machine tool, so that corresponding workpieces can be machined. At present, the work cycle of a power sliding table hydraulic system of a combined machine tool is as follows: fast forward → first working advance → second working advance → stop iron stop → fast backward → stop, in order to complete the working cycle, besides using the stroke valve, the speed change loop also needs a two-position three-way electromagnetic valve and two speed regulating valves connected in series, and elements such as electric stroke switch, stop iron, etc., which results in the defects of complex structure, large energy consumption, low control precision, etc. of the power slipway hydraulic system.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a hydraulic system of a power sliding table of a combined machine tool, which has the advantages of simple structure, low energy consumption, high control precision and the like.

In order to achieve the purpose, the invention adopts the technical scheme that:

a power sliding table hydraulic system of a combined machine tool comprises a single-rod piston cylinder 1, wherein a piston rod of the single-rod piston cylinder 1 is fixedly connected with a fixed wall 19 vertically, a speed control strip 2 is axially fixed on the outer side of a cylinder barrel of the single-rod piston cylinder 1, the height of an AB section on the speed control strip 2 controls the speed of 'one-step feeding', the length of the AB section controls the duration time of the 'one-step feeding', the height of a BC section controls the speed of 'two-step feeding', the length of the BC section controls the duration time of the 'two-step feeding', when the single-rod piston cylinder 1 extends until a CD section on the speed control strip 2 presses down a roller of a stroke valve 3, the stroke valve 3 is closed, and the single-rod piston cylinder 1 stops moving; the travel valve 3 is a two-position two-way motorized valve, a roller at the upper end of the travel valve tightly abuts against the speed control strip 2, the travel valve 3 is connected with the quick-return check valve 4 in parallel, an outlet of the travel valve 3 is communicated with a rodless cavity of the single-rod piston cylinder 1, and an inlet of the travel valve 3 is connected with a left oil port at the upper part of the electro-hydraulic reversing valve 15 and an outlet of the quick-feed check valve 5; the electro-hydraulic directional valve 15 is a three-position five-way electromagnetic hydraulic directional slide valve with an M-shaped middle position function, a right oil port at the upper part of the electro-hydraulic directional valve 15 is communicated with a rod cavity of the single-rod piston cylinder 1, and a left oil port at the lower part of the electro-hydraulic directional valve 15 is connected with the oil tank 10 through a throttling back pressure valve 14; an oil port in the middle of the lower part of the electro-hydraulic directional valve 15 is connected with an outlet of the pressure supply one-way valve 13, an inlet of the pressure supply one-way valve 13 is connected with an oil outlet of the hydraulic pump 12, and an oil inlet of the hydraulic pump 12 is connected with the oil tank 10 through an oil filter 11;

an inlet of the fast forward one-way valve 5 and a right oil port at the lower part of the electro-hydraulic reversing valve 15 are connected with an inlet of the external control leakage type unloading valve 8, and an outlet of the external control leakage type unloading valve 8 is connected with an oil tank 10 through a back pressure overflow valve 9;

the positive poles of a 1YA coil and a 2YA coil of the electro-hydraulic reversing valve 15 are respectively connected to two binding posts of a pressure relay 18 through leads, the negative poles of the 1YA coil and the 2YA coil are both connected to the negative pole of a power supply, a normally open type delayer 17 is connected in series between the positive pole of the 2YA coil and the pressure relay 18, and a power supply binding post of the pressure relay 18 and the positive pole of the power supply are connected with two ends of a power switch 16; the inlet of the stroke valve 3 is communicated with the inlet of the relay one-way valve 6, the outlet of the relay one-way valve 6 is connected with the pressure relay 18, and the delay throttle valve 7 is connected with the relay one-way valve 6 in parallel.

The height and the length of each section of the speed control strip 2 can be adjusted by replacement.

The fast forward stroke of the single-rod piston cylinder 1 can be adjusted by moving the position of the stroke valve 3 left and right, and the fast forward movement speed can be adjusted by moving the position of the stroke valve 3 up and down.

The single-rod piston cylinder 1 works in a mode that a piston rod is fixed and a cylinder barrel moves linearly, and a hydraulic oil inlet path and an oil return path are both arranged inside the piston rod.

The invention has the beneficial effects that:

according to the invention, the speed control bar 2 fixed on the single-rod piston cylinder 1 is adopted to control the opening degree of the valve port of the stroke valve 3, so that the flow rate leading to the single-rod piston cylinder 1 is controlled, the movement speed of the single-rod piston cylinder 1 is finally controlled, the power sliding table hydraulic system of the combined machine tool is greatly simplified, and the combined machine tool has the advantages of simple structure, low energy consumption, high control precision and the like.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

Referring to fig. 1, a power sliding table hydraulic system of a combined machine tool comprises a single-rod piston cylinder 1, a piston rod of the single-rod piston cylinder 1 is fixedly connected with a fixed wall 19 vertically, a speed control strip 2 is fixed on the outer side of a cylinder barrel of the single-rod piston cylinder 1 along the axial direction, the height of an AB section on the speed control strip 2 controls the speed of 'first feeding', the length of the AB section controls the duration time of the 'first feeding', the height of a BC section controls the speed of 'second feeding', the length of the BC section controls the duration time of the 'second feeding', when the single-rod piston cylinder 1 extends out until a CD section on the speed control strip 2 presses down a roller of a stroke valve 3, the stroke valve 3 is closed, and the single-rod piston cylinder 1 stops moving; the travel valve 3 is a two-position two-way motorized valve, a roller at the upper end of the travel valve tightly abuts against the speed control strip 2, the travel valve 3 is connected with the quick-return check valve 4 in parallel, an outlet of the travel valve 3 is communicated with a rodless cavity of the single-rod piston cylinder 1, and an inlet of the travel valve 3 is connected with a left oil port at the upper part of the electro-hydraulic reversing valve 15 and an outlet of the quick-feed check valve 5; the electro-hydraulic directional valve 15 is a three-position five-way electromagnetic hydraulic directional slide valve with an M-shaped middle position function, a right oil port at the upper part of the electro-hydraulic directional valve 15 is communicated with a rod cavity of the single-rod piston cylinder 1, and a left oil port at the lower part of the electro-hydraulic directional valve 15 is connected with the oil tank 10 through a throttling back pressure valve 14; an oil port in the middle of the lower part of the electro-hydraulic directional valve 15 is connected with an outlet of the pressure supply one-way valve 13, an inlet of the pressure supply one-way valve 13 is connected with an oil outlet of the hydraulic pump 12, and an oil inlet of the hydraulic pump 12 is connected with the oil tank 10 through an oil filter 11;

an inlet of the fast forward one-way valve 5 and a right oil port at the lower part of the electro-hydraulic reversing valve 15 are connected with an inlet of the external control leakage type unloading valve 8, and an outlet of the external control leakage type unloading valve 8 is connected with an oil tank 10 through a back pressure overflow valve 9;

the positive poles of a 1YA coil and a 2YA coil of the electro-hydraulic reversing valve 15 are respectively connected to two binding posts of a pressure relay 18 through leads, the negative poles of the 1YA coil and the 2YA coil are both connected to the negative pole of a power supply, a normally open type delayer 17 is connected in series between the positive pole of the 2YA coil and the pressure relay 18, and a power supply binding post of the pressure relay 18 and the positive pole of the power supply are connected with two ends of a power switch 16; the inlet of the stroke valve 3 is communicated with the inlet of the relay one-way valve 6, the outlet of the relay one-way valve 6 is connected with the pressure relay 18, and the delay throttle valve 7 is connected with the relay one-way valve 6 in parallel.

The height and the length of each section of the speed control strip 2 can be adjusted by replacement.

The fast forward stroke of the single-rod piston cylinder 1 can be adjusted by moving the position of the stroke valve 3 left and right, and the fast forward movement speed can be adjusted by moving the position of the stroke valve 3 up and down.

The single-rod piston cylinder 1 works in a mode that a piston rod is fixed and a cylinder barrel moves linearly, and a hydraulic oil inlet path and an oil return path are both arranged inside the piston rod.

The working principle of the invention is as follows: referring to table 1, the states and changes of the elements are described in table 1 throughout the entire duty cycle.

TABLE 1 states of elements in the working cycle

Referring to fig. 1, the flow rate of oil in the rodless cavity of the single-rod piston cylinder 1 is controlled by changing the flow cross-sectional area of the stroke valve 3, and finally the extension speed of the cylinder body of the single-rod hydraulic cylinder 1 is controlled, which is expressed by the following formula:

in the formula, the v-single-rod piston cylinder 1 moves (extends) leftwards; the q-stroke valve is used for conveying the oil flow to the rodless cavity of the single-rod piston cylinder 1; aw is the effective area of the rodless cavity piston acting on the single-rod piston cylinder 1; ax-stroke valve port area; k-stroke valve coefficient; delta p-inlet-outlet pressure difference of the stroke valve; the valve port index of the m-stroke valve is 0.5 for a thin-wall small hole or a short hole, and 1 for a long hole.