CN112032119B

CN112032119B - Auxiliary clamping roller hydraulic control valve table of continuous casting billet large reduction rolling mill

Info

Publication number: CN112032119B
Application number: CN202010990884.5A
Authority: CN
Inventors: 田秀平; 张雪; 韩清刚; 秦艳梅
Original assignee: Beijing Shougang International Engineering Technology Co Ltd
Current assignee: Beijing Shougang International Engineering Technology Co Ltd
Priority date: 2020-09-19
Filing date: 2020-09-19
Publication date: 2024-08-27
Anticipated expiration: 2040-09-19
Also published as: CN112032119A

Abstract

A hydraulic control valve table for auxiliary clamping rollers of a continuous casting billet large-reduction rolling mill belongs to the technical field of hydraulic systems in metallurgical industry. The hydraulic cylinder comprises an inlet 1# transmission side auxiliary clamping roller hydraulic cylinder, a one-way valve I, a hydraulic control one-way valve I, a proportional valve I, a balance type normally closed logic valve I, an electromagnetic unloading valve I, a pressure sensor I and a balance valve I; an auxiliary clamping roller hydraulic cylinder at the inlet 1# operation side, a second one-way valve, a second hydraulic control one-way valve, a second proportional valve, a second balanced normally closed logic valve, a second electromagnetic unloading valve, a second pressure sensor and a second balanced valve; and an electromagnetic reversing valve I. The high-pressure rolling mill has the advantages that the high-pressure rolling technology of the rolling mill is realized through the hydraulic loop control of the auxiliary clamping roller valve table, so that the loose defect of the center of a casting blank is improved or eliminated, the density of the casting blank is improved, and the stable production of thick plates and large-specification profiles under the condition of low rolling compression ratio is realized. The technical transformation is easy to realize, and the market demand is large.

Description

Auxiliary clamping roller hydraulic control valve table of continuous casting billet large reduction rolling mill

Technical Field

The invention belongs to the technical field of hydraulic systems in the metallurgical industry, and particularly provides an auxiliary clamping roller hydraulic control valve table of a continuous casting billet large-pressure rolling mill. The method is suitable for upgrading and reforming the existing domestic steelmaking continuous casting machine in the metallurgical industry and the production line of the new steelmaking continuous casting machine.

Background

The solidification end high-pressure technology of the continuous casting blank is developed based on the solidification end light-pressure technology, and is suitable for the next generation of new continuous casting technology of large-section continuous casting blanks.

The purpose of adopting the solidification end large-pressure technology is as follows: aiming at the problem-loosening defect which is frequently caused by rolling an ultra-thick plate with the thickness of more than 100mm, the common solution is to adopt a die-cast steel ingot, an electroslag remelting steel ingot or an ultra-thick vertical casting machine to produce a casting blank, and ensure the quality of a steel plate core part with a large rolling compression ratio (more than or equal to 4-5). The continuous casting blank solidification end large-reduction technology is that a pair of large-diameter rollers are adopted to implement large-reduction (more than or equal to 10 mm) at the position of the blank solidification end, so that the center of a casting blank is subjected to metal flow deformation, feeding (shrinkage cavity and loosening generated by filling solidification shrinkage) is performed, the loosening defect of the center of the casting blank is obviously improved or eliminated, the density of the casting blank is improved, and the stable production of thick plates and large-specification sections under the condition of low rolling compression ratio is realized.

At present, the practical cases of the continuous casting slab solidification end high-pressure technology are mainly in japan and korea. The plate mill in Tang Gang in China also carries out a process practice of large reduction, wherein the reduction is in the form of sector reduction. The domestic rolling mill form high-pressure technology is still in the research stage. The Beijing university of science and technology has made prospective researches on the technique of large reduction of the solidification end of a continuous casting billet, and has obtained a plurality of patents on the technique of large reduction. Shoudu Iron and Steel Co International engineering technology Co-operation with Beijing university of science and technology, the related research results are engineered for the first time and applied to the Beijing Tang-two-stage steelmaking continuous casting engineering No. 1 slab caster project.

The sector section of the Beijing Tang second-stage 1# slab continuous casting machine is updated and transformed into novel equipment with the large reduction function, and the large reduction technology is implemented by adjusting the solidification tail end of a casting blank of a cooling system of the continuous casting machine. However, to realize the large reduction technology, not only the control of the reduction hydraulic cylinders of the large reduction rolling mill is needed, but also the hydraulic control of the auxiliary clamping rollers of the rolling mill inlet 2 groups and the auxiliary clamping rollers of the rolling mill outlet 2 groups is of great importance. Inlet 1# auxiliary clamping roller, inlet 2# auxiliary clamping roller are arranged at the inlet of the high-pressure rolling mill, outlet 1# auxiliary clamping roller, and outlet 2# auxiliary clamping roller are arranged at the outlet of the high-pressure rolling mill. The Inlet 1 auxiliary clamping roller is controlled by an Inlet 1 transmission side auxiliary clamping roller hydraulic cylinder and an Inlet 1 operation side auxiliary clamping roller hydraulic cylinder. The inlet 2# auxiliary clamping roller is controlled by an inlet 2# transmission side auxiliary clamping roller hydraulic cylinder and an inlet 2# operation side auxiliary clamping roller hydraulic cylinder. The outlet 1# auxiliary clamping roller is controlled by an outlet 1# transmission side auxiliary clamping roller hydraulic cylinder and an outlet 1# operation side auxiliary clamping roller hydraulic cylinder. The outlet 2# auxiliary clamping roller is controlled by an outlet 2# transmission side auxiliary clamping roller hydraulic cylinder and an outlet 2# operation side auxiliary clamping roller hydraulic cylinder. The auxiliary clamping roller hydraulic cylinder is mainly used for controlling pressure and position. Each group of auxiliary clamping roller hydraulic cylinders can independently realize pressing and lifting. At present, no intellectual property and technical standard of continuous casting billet high-pressure hydraulic control technology in the mode of jointly controlling a rolling mill and an auxiliary clamping roller exist in China.

Disclosure of Invention

The invention aims to provide an auxiliary clamping roller hydraulic control valve table of a continuous casting billet large-reduction rolling mill, which improves or eliminates loose defects in the center of a casting blank through a large-reduction technology of the large-reduction rolling mill, improves the compactness of the casting blank and realizes stable production of thick plates and large-specification sectional materials under the condition of low rolling compression ratio. The oil cylinder is controlled in pressure and position through the full-hydraulic pressing control loop, so that the requirements of controlling two main technological parameters of the rolling force and the pressing amount of the auxiliary clamping roller are met. The automatic control system is used for controlling the control command sent by the automatic control system along with the position tracking signal of the solidification tail end of the casting blank and the high-pressure rolling mill together to realize the high-pressure function; tracking the solidification position of the casting blank core, and controlling the roll gap together with the large reduction rolling mill to realize the soft reduction function; and tracking the solidification tail end position of the casting blank, and assisting the low-pressure clamping action of the clamping rollers before and after the casting blank is completely solidified, so as to realize the low-pressure clamping function.

The invention comprises the following steps:

The auxiliary clamping roller hydraulic cylinder 11 at the transmission side of the inlet No. 1 is provided with a check valve I52, a hydraulic control check valve I1, a proportional valve I3, a balance type normally closed logic valve I4, an electromagnetic unloading valve I6, a pressure sensor I9 and a balance valve I10; the auxiliary clamping roller hydraulic cylinder 15 at the inlet No. 1 operation side, the second one-way valve 46, the second hydraulic control one-way valve 48, the second proportional valve 51, the second balance normally-closed logic valve 12, the second electromagnetic unloading valve 8, the second pressure sensor 13 and the second balance valve 14; electromagnetic directional valve one 50;

An inlet 2# transmission side auxiliary clamping roller hydraulic cylinder 19, a check valve III 41, a hydraulic control check valve III 43, a proportional valve III 44, a balance type normally closed logic valve III 20, an electromagnetic unloading valve III 16, a pressure sensor III 17 and a balance valve III 18; an auxiliary clamping roller hydraulic cylinder 24 at the inlet 2# operation side, a one-way valve IV 37, a hydraulic control one-way valve IV 38, a proportional valve IV 34, a balance type normally closed logic valve IV 53, an electromagnetic unloading valve IV 21, a pressure sensor IV 25 and a balance valve IV 23; electromagnetic directional valve two 40;

The auxiliary clamping roller hydraulic cylinder 61 at the transmission side of the outlet No. 1 is provided with a check valve five 96, a hydraulic control check valve five 54, a proportional valve five 56, a balance type normally closed logic valve five 57, an electromagnetic unloading valve five 59, a pressure sensor five 60 and a balance valve five 97; the auxiliary clamping roller hydraulic cylinder 66 at the outlet 1# operation side, a one-way valve six 91, a hydraulic control one-way valve six 93, a proportional valve six 92, a balance type normally closed logic valve six 67, an electromagnetic unloading valve six 62, a pressure sensor six 64 and a balance valve six 65; electromagnetic directional valve three 95;

the auxiliary clamping roller hydraulic cylinder 71 at the transmission side of the outlet No. 2, a one-way valve seven 88, a hydraulic control one-way valve seven 89, a proportional valve seven 83, a balance type normally closed logic valve seven 73, an electromagnetic unloading valve seven 68, a pressure sensor seven 72 and a balance valve seven 70; an outlet 2# operation side auxiliary clamping roller hydraulic cylinder 74, a one-way valve eight 85, a hydraulic control one-way valve eight 84, a proportional valve eight 81, a balance type normally closed logic valve eight 79, an electromagnetic unloading valve eight 77, a pressure sensor eight 76 and a balance valve eight 75; electromagnetic directional valve IV 87;

A pressure sensor nine 26, an electromagnetic directional valve five 28, an accumulator 29, an overflow valve 30, a three-way proportional pressure reducing valve 32, a one-way valve nine 35 and a one-way valve ten 36.

The port b of the first hydraulic control check valve 1 is connected with the pressure oil pipe P1, and the port a is connected with the port P of the first proportional valve 3; the port a of the proportional valve I3 is connected with the port p of the balance normally closed logic valve I4; the port a of the balance type normally closed logic valve I4 is communicated with the port p of the electromagnetic unloading valve I6 and the pressure sensor I9, and is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 11 at the inlet No. 1 transmission side through a ball valve and a hose. The T port of the proportional valve I3 is connected with the one-way valve I52 and is communicated with the oil return pipeline T. The T port of the electromagnetic unloading valve I6 is communicated with an oil return pipeline T;

The port b of the second hydraulic control check valve 48 is connected with the pressure oil pipe P1, and the port a is connected with the port P of the second proportional valve 51; the port a of the second proportional valve 51 is connected with the port p of the second 12 of the balance normally closed logic valve; the port a of the balance type normally closed logic valve II 12 is communicated with the port p of the electromagnetic unloading valve II 8 and the pressure sensor II 13, and is connected with a rodless cavity of the auxiliary clamping roller hydraulic cylinder 15 at the inlet No. 1 operation side through a ball valve and a hose; the T port of the second proportional valve 51 is connected with the second check valve 46 and is communicated with an oil return pipeline T; the T port of the electromagnetic unloading valve II 8 is communicated with an oil return pipeline T.

The port P of the electromagnetic directional valve I50 is connected with a main oil supply pipeline P1, the port T of the electromagnetic directional valve I50 is connected with a main oil return pipeline T, and the port a of the electromagnetic directional valve I50 is connected with the control oil port x of the hydraulic control one-way valve I1, the hydraulic control one-way valve II 48, the balance type normally closed logic valve I4 and the balance type normally closed logic valve II 12; the oil drain Y ports of the first hydraulic control check valve 1, the second hydraulic control check valve 48, the first balance type normally closed logic valve 4 and the second balance type normally closed logic valve 12 are connected with the valve table total oil drain Y1 in a summarizing way.

The port b of the third hydraulic control check valve 43 is connected with the pressure oil pipe P1, and the port a of the third hydraulic control check valve 43 is connected with the port P of the third proportional valve 44; the port a of the proportional valve III 44 is connected with the port p of the balance normally closed logic valve III 20; the port a of the balance type normally closed logic valve III 20 is communicated with the port p of the electromagnetic unloading valve III 16 and the pressure sensor III 17, and is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 19 at the inlet No. 2 transmission side through a ball valve and a hose. The T port of the third proportional valve 44 is connected with the third check valve 41 and is communicated with an oil return pipeline T. The T port of the electromagnetic unloading valve III 16 is communicated with an oil return pipeline T.

The port b of the hydraulic control one-way valve IV 38 is connected with the pressure oil pipe P1, and the port a of the hydraulic control one-way valve IV 38 is connected with the port P of the proportional valve IV 34; the port a of the proportional valve IV 34 is connected with the port p of the balance normally closed logic valve IV 53; the port a of the balance type normally closed logic valve IV 53 is communicated with the port p of the electromagnetic unloading valve IV 21 and the pressure sensor IV 25, and is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 24 at the inlet No. 2 operation side through a ball valve and a hose. The T port of the proportional valve IV 34 is connected with the check valve IV 37 and is communicated with an oil return pipeline T; the T port of the electromagnetic unloading valve IV 21 is communicated with an oil return pipeline T.

The P port of the electromagnetic directional valve II 40 is connected with a main oil supply pipeline P1, the T port of the electromagnetic directional valve II 40 is connected with a main oil return pipeline T, and the a port of the electromagnetic directional valve II 40 is connected with the control oil x port of the hydraulic control one-way valve III 43, the hydraulic control one-way valve IV 38, the balance type normally closed logic valve III 20 and the balance type normally closed logic valve IV 53; the drain Y ports of the third hydraulic control check valve 43, the fourth hydraulic control check valve 38, the third balance normally-closed logic valve 20 and the fourth balance normally-closed logic valve 53 are connected with the valve table total drain Y1 in a summarizing way.

The port b of the hydraulic control one-way valve five 54 is connected with the pressure oil pipe P1, and the port a of the hydraulic control one-way valve five 54 is connected with the port P of the proportional valve five 56; the port a of the proportional valve five 56 is connected with the port p of the five 57 of the balance normally-closed logic valve; the port a of the balance type normally closed logic valve five 57 is communicated with the port p of the electromagnetic unloading valve five 59 and the pressure sensor five 60, and is connected with a rodless cavity of the auxiliary clamping roller hydraulic cylinder 61 at the transmission side of the outlet No. 1 through a ball valve and a hose; the T port of the proportional valve five 56 is connected with the check valve five 96 and is communicated with an oil return pipeline T; the T port of the electromagnetic unloading valve five 59 is communicated with an oil return pipeline T.

The port b of the hydraulic control check valve six 93 is connected with the pressure oil pipe P1, and the port a of the hydraulic control check valve six 93 is connected with the port P of the proportional valve six 92; the port a of the proportional valve six 92 is connected with the port p of the six 67 of the balance normally closed logic valve; the port a of the balance normally closed logic valve six 67 is communicated with the port p of the electromagnetic unloading valve six 62 and the pressure sensor six 64, and is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 66 at the outlet No. 1 operation side through a ball valve and a hose. The T port of the proportional valve six 92 is connected with the check valve four six 91 and is communicated with the oil return pipeline T. The T port of the electromagnetic unloading valve six 62 is communicated with an oil return pipeline T.

The P port of the electromagnetic directional valve III 95 is connected with a main oil supply pipeline P1, the T port of the electromagnetic directional valve III 95 is connected with a main oil return pipeline T, and the a port of the electromagnetic directional valve III 95 is connected with the control oil x port of the hydraulic control one-way valve V54, the hydraulic control one-way valve V93, the balance type normally-closed logic valve V57 and the balance type normally-closed logic valve V67; the hydraulic control check valve five 54, the hydraulic control check valve six 93, the balance type normally closed logic valve five 57 and the balance type normally closed logic valve six 67 are connected with the valve table total oil drain pipe Y1 in a summary way.

The port b of the hydraulic control one-way valve seven 89 is connected with the pressure oil pipe P1, and the port a of the hydraulic control one-way valve seven 89 is connected with the port P of the proportional valve seven 83; the port a of the proportional valve seven 83 is connected with the port p of the seven 73 of the balance normally closed logic valve; the port a of the balance normally closed logic valve seven 73 is communicated with the port p of the electromagnetic unloading valve seven 68 and the pressure sensor seven 72, and is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 71 at the outlet 2# transmission side through a ball valve and a hose. The T port of the proportional valve seven 83 is connected with the one-way valve seven 88, and an oil return pipeline T is connected; the T port of the electromagnetic unloading valve seven 68 is communicated with an oil return pipeline T.

The port b of the hydraulic control one-way valve eight 84 is connected with the pressure oil pipe P1, and the port a is connected with the port P of the proportional valve eight 81; the port a of the proportional valve eight 81 is connected with the port p of the eight 79 of the balance normally closed logic valve; the port a of the balance normally closed logic valve eight 79 is communicated with the port p of the electromagnetic unloading valve eight 77 and the pressure sensor eight 76, and is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 74 at the outlet 2# operation side through a ball valve and a hose. The T port of the proportional valve eight 81 is connected with the one-way valve eight 85 and is communicated with the oil return pipeline T. The T port of the electromagnetic unloading valve eight 77 is communicated with an oil return pipeline T.

The P port of the electromagnetic reversing valve IV 87 is connected with a main oil supply pipeline P1, the T port is connected with a main oil return pipeline T, and the a port is connected with a control oil x port of the hydraulic control one-way valve IV 89, the hydraulic control one-way valve IV 84, the balance type normally closed logic valve IV 73 and the balance type normally closed logic valve IV 79; the drain port of the hydraulic control one-way valve seven 89, the hydraulic control one-way valve eight 84, the balance type normally closed logic valve seven 73 and the balance type normally closed logic valve eight 79 are connected with the valve table total drain pipe Y1 in a summarizing way.

The rod cavity of the auxiliary clamping roller hydraulic cylinder 11 at the inlet 1# transmission side is communicated with the a port of the balance valve I10, and the rod cavity of the auxiliary clamping roller hydraulic cylinder 15 at the inlet 1# operation side is communicated with the a port of the balance valve II 14; the hydraulic cylinder 19 of the auxiliary clamping roller at the inlet No. 2 transmission side is provided with a rod cavity which is communicated with an a port of a balance valve III 18; the hydraulic cylinder 24 of the auxiliary clamping roller at the inlet 2# operation side is provided with a rod cavity which is communicated with an a port of a balance valve IV 23; the hydraulic cylinder 61 of the auxiliary clamping roller at the transmission side of the outlet No. 1 is provided with a rod cavity which is communicated with an a port of a balance valve five 97; the hydraulic cylinder 66 of the auxiliary clamping roller at the outlet 1# operation side is provided with a rod cavity which is communicated with an a port of a balance valve six 65; the outlet 2# transmission side auxiliary clamping roller hydraulic cylinder 71 has a rod cavity communicated with the a port of the balance valve seven 70, and the outlet 2# operation side auxiliary clamping roller hydraulic cylinder 74 has a rod cavity communicated with the a port of the balance valve eight 75.

The port b of the balance valve I10, the port b of the balance valve II 14, the port b of the balance valve III 18, the port b of the balance valve IV 23, the port b of the balance valve V97, the port b of the balance valve VI 65, the port b of the balance valve V70 and the port b of the balance valve V75 are converged into an oil way through a ball valve and a rubber pipe, and are communicated with the port a of the electromagnetic directional valve V28 and the pressure sensor V26; the p port of the electromagnetic directional valve five 28 is communicated with the a port of the three-way proportional pressure reducing valve 32, the p port of the overflow valve 30, the b port of the one-way valve ten 36 and the p port of the energy accumulator 29; the P port of the three-way proportional pressure reducing valve 32 is connected with a valve table total pressure oil pipe P1, and the T port of the three-way proportional pressure reducing valve 32 is communicated with an oil return pipeline T through a one-way valve nine 35; the T port of the overflow valve 30 and the T port of the accumulator 29 are connected back to the valve table main oil return pipe T; the port a of the check valve ten 36 is communicated with an oil return pipeline T.

The pressure sensor I9, the pressure sensor II 13, the pressure sensor III 17, the pressure sensor IV 25, the pressure sensor V60, the pressure sensor VI 64, the pressure sensor seven 72, the pressure sensor eight 76 and the pressure sensor nine 26 have analog output functions and are mechanical.

The first hydraulic control check valve 1, the second hydraulic control check valve 48, the third hydraulic control check valve 43, the fourth hydraulic control check valve 38, the fifth hydraulic control check valve 54, the sixth hydraulic control check valve 93, the seventh hydraulic control check valve 89 and the eighth hydraulic control check valve 84 are external-control leakage hydraulic control check valves.

The proportional valve I3, the proportional valve II 51, the proportional valve III 44, the proportional valve IV 34, the proportional valve V56, the proportional valve VI 92, the proportional valve V83 and the proportional valve V81 are direct-acting, current-controlled, three-position four-way, proportional electromagnet and directional valve.

The electromagnetic reversing valve five 28 is a 2-position 2-way reversing valve.

The electromagnetic directional valve I50, the electromagnetic directional valve II 40, the electromagnetic directional valve III 95, the electromagnetic directional valve IV 87 and the 2-position 4-way directional valve.

The balance type normally-closed logic valve I4, the balance type normally-closed logic valve II 12, the balance type normally-closed logic valve III 20, the balance type normally-closed logic valve IV 53, the balance type normally-closed logic valve V57, the balance type normally-closed logic valve VI, the balance type normally-closed logic valve V73 and the balance type normally-closed logic valve V79 are 2-bit 2-way, hydraulic control and normally-closed logic valves.

The electromagnetic unloading valve I6, the electromagnetic unloading valve II 8, the electromagnetic unloading valve III 16, the electromagnetic unloading valve IV 21, the electromagnetic unloading valve IV 59, the electromagnetic unloading valve VI 62, the electromagnetic unloading valve seven 68 and the electromagnetic unloading valve eight 77 are normally open type unloading valves.

The first relief valve 30 is a direct-acting relief valve.

The first pressure reducing valve 32 is a three-way valve, a proportional electromagnet and a current control pressure reducing valve.

The invention has the advantages that: the high-pressure reduction technology of the rolling mill is realized through the hydraulic control of the auxiliary roller hydraulic valve table loop, so that the loose defect of the center of a casting blank is improved or eliminated, the density of the casting blank is improved, and the stable production of thick plates and large-specification sectional materials under the condition of low rolling compression ratio is realized. The technical transformation is easy to realize, and the market demand is large.

Drawings

Fig. 1 is a schematic diagram of a valve seat structure.

Fig. 2 is a continuation of fig. 1.

In the figure, an inlet No. 1 transmission side auxiliary clamping roller hydraulic cylinder 11, a one-way valve I52, a hydraulic control one-way valve I1, a proportional electromagnet I2, a proportional valve I3, a balance type normally closed logic valve I4, an electromagnet I5, an electromagnetic unloading valve I6, a pressure sensor I9 and a balance valve I10; the auxiliary clamping roller hydraulic cylinder 15 at the inlet No. 1 operation side, a second check valve 46, a second hydraulic control check valve 48, a second proportional electromagnet 47, a second proportional valve 51, a second balance normally closed logic valve 12, a second electromagnet 7, a second electromagnetic unloading valve 8, a second pressure sensor 13 and a second balance valve 14; electromagnet nine 49, electromagnetic reversing valve one 50.

The auxiliary clamping roller hydraulic cylinder 19 at the inlet No. 2 transmission side, a one-way valve III 41, a hydraulic control one-way valve III 43, a proportional electromagnet III 42, a proportional valve III 44, a balance type normally closed logic valve III 20, an electromagnet III 45, an electromagnetic unloading valve III 16, a pressure sensor III 17 and a balance valve III 18. An auxiliary clamping roller hydraulic cylinder 24 at the inlet 2# operation side, a one-way valve IV 37, a hydraulic control one-way valve IV 38, a proportional electromagnet IV 33, a proportional valve IV 34, a balance type normally closed logic valve IV 53, an electromagnet IV 22, an electromagnetic unloading valve IV 21, a pressure sensor IV 25 and a balance valve IV 23; electromagnet ten 39, electromagnetic reversing valve two 40.

The auxiliary clamping roller hydraulic cylinder 61 at the transmission side of the outlet No. 1 is provided with a check valve five 96, a hydraulic control check valve five 54, a proportional electromagnet five 55, a proportional valve five 56, a balance type normally closed logic valve five 57, an electromagnet five 58, an electromagnetic unloading valve five 59, a pressure sensor five 60 and a balance valve five 97; the auxiliary clamping roller hydraulic cylinder 66 at the outlet No. 1 operation side, a one-way valve six 91, a hydraulic control one-way valve six 93, a proportional electromagnet six 90, a proportional valve six 92, a balance type normally closed logic valve six 67, an electromagnet six 63, an electromagnetic unloading valve six 62, a pressure sensor six 64 and a balance valve six 65; electromagnet eleven 94, electromagnetic reversing valve three 95,

The auxiliary clamping roller hydraulic cylinder 71 at the transmission side of the outlet No. 2, a one-way valve seven 88, a hydraulic control one-way valve seven 89, a proportional electromagnet seven 82, a proportional valve seven 83, a balance type normally closed logic valve seven 73, an electromagnet seven 69, an electromagnetic unloading valve seven 68, a pressure sensor seven 72 and a balance valve seven 70; an outlet 2# operation side auxiliary clamping roller hydraulic cylinder 74, a one-way valve eight 85, a hydraulic control one-way valve eight 84, a proportional electromagnet eight 80, a proportional valve eight 81, a balance type normally closed logic valve eight 79, an electromagnet eight 78, an electromagnetic unloading valve eight 77, a pressure sensor eight 76 and a balance valve eight 75; twelve electromagnets 86 and four electromagnetic reversing valves 87.

Pressure sensor nine 26, electro-magnet thirteen 27, electromagnetic valve five 28, energy accumulator 29, overflow valve 30, proportion electro-magnet nine 31, three-way proportion pressure reducing valve 32, one-way valve nine 35, one-way valve ten 36.

Detailed Description

The invention comprises an inlet No. 1 transmission side auxiliary clamping roller hydraulic cylinder 11, a one-way valve I52, a hydraulic control one-way valve I1, a proportional electromagnet I2, a proportional valve I3, a balance type normally closed logic valve I4, an electromagnet I5, an electromagnetic unloading valve I6, a pressure sensor I9 and a balance valve I10; the auxiliary clamping roller hydraulic cylinder 15 at the inlet No. 1 operation side, a second check valve 46, a second hydraulic control check valve 48, a second proportional electromagnet 47, a second proportional valve 51, a second balance normally closed logic valve 12, a second electromagnet 7, a second electromagnetic unloading valve 8, a second pressure sensor 13 and a second balance valve 14; electromagnet nine 49, electromagnetic reversing valve one 50.

The following describes specific embodiments of the present invention with reference to the drawings.

1. Inlet 1# auxiliary nip roll loop

The port b of the first hydraulic control check valve 1 is connected with the pressure oil pipe P1, and the port a is connected with the port P of the first proportional valve 3; the port a of the proportional valve I3 is connected with the port p of the balance type normally-closed logic valve I4, and the port a of the balance type normally-closed logic valve I4 is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 11 at the inlet No. 1 transmission side through a ball valve and a hose. The port b of the second hydraulic control check valve 48 is connected with the pressure oil pipe P1, and the port a is connected with the port P of the second proportional valve 51; the port a of the second proportional valve 51 is connected with the port p of the second 12 of the balance type normally closed logic valve, and the port a of the second 12 of the balance type normally closed logic valve is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 15 at the inlet No. 1 operation side through a ball valve and a hose. The T port of the proportional valve I3 is connected with the one-way valve I52 and is communicated with the oil return pipeline T. The T port of the second proportional valve 51 is connected with the second check valve 46 and is communicated with an oil return pipeline T. The port P of the electromagnetic directional valve I50 is connected with a main oil supply pipeline P1, the port T is connected with a main oil return pipeline T, and the port a is connected with the control oil port x of the hydraulic control one-way valve I1, the hydraulic control one-way valve II 48, the balance type normally closed logic valve I4 and the balance type normally closed logic valve II 12;

The electromagnet nine 49 is electrified, so that the electromagnetic directional valve one 50 is switched on, and the p port and the a port of the electromagnetic directional valve one 50 are communicated. The port a of the electromagnetic directional valve I50 is connected with the control oil port x of the hydraulic control one-way valve I1, the hydraulic control one-way valve II 48, the balance type normally-closed logic valve I4 and the balance type normally-closed logic valve II 12, so that the port b of the hydraulic control one-way valve I1 and the hydraulic control one-way valve II 48 is communicated with the port a, the port p of the balance type normally-closed logic valve I4 and the balance type normally-closed logic valve II 12 is communicated with the port a, and the rodless cavity of the auxiliary clamping roller hydraulic cylinder 11 at the transmission side of the inlet 1# and the rodless cavity of the auxiliary clamping roller hydraulic cylinder 15 at the operation side of the inlet 1# are respectively communicated. Meanwhile, the electromagnet I5 and the electromagnet II 7 are electrified, so that the p port and the t port of the electromagnetic unloading valve I6 and the electromagnetic unloading valve II 8 are disconnected. At this time, the oil way enters a communicating and pressurized working state.

The first proportional electromagnet 2 and the second proportional electromagnet 47 input current signals to enable the p port/t port of the first proportional valve 3 and the second proportional valve 51 to be communicated with the a port, so that the pressing/lifting control of the rodless cavity of the oil cylinder is realized.

2. Inlet 2# auxiliary nip roll loop

The port b of the hydraulic control one-way valve III 43 is connected with the pressure oil pipe P1, and the port a is connected with the port P of the proportional valve III 44; the port a of the proportional valve III 44 is connected with the port p of the balance type normally-closed logic valve III 20, and the port a of the balance type normally-closed logic valve III 20 is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 19 at the inlet No. 2 transmission side through a ball valve and a hose. The port b of the hydraulic control check valve IV 38 is connected with the pressure oil pipe P1, and the port a is connected with the port P of the proportional valve IV 34; the port a of the proportional valve IV 34 is connected with the port p of the balance type normally closed logic valve IV 53, and the port a of the balance type normally closed logic valve IV 53 is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 24 at the inlet No. 2 operation side through a ball valve and a hose. The T port of the third proportional valve 44 is connected with the third check valve 41 and is communicated with an oil return pipeline T. The T port of the proportional valve IV 34 is connected with the check valve IV 37 and is communicated with an oil return pipeline T. The P port of the electromagnetic reversing valve II 40 is connected with a main oil supply pipeline P1, the T port is connected with a main oil return pipeline T, and the a port is connected with a control oil x port of the hydraulic control one-way valve III 43, the hydraulic control one-way valve IV 38, the balance type normally-closed logic valve III 20 and the balance type normally-closed logic valve IV 53;

The electromagnet is electrified ten 39, so that the second electromagnetic reversing valve 40 is reversed, and the p port and the a port of the second electromagnetic reversing valve 40 are communicated. The port a of the electromagnetic reversing valve II 40 is connected with the control oil port x of the hydraulic control check valve III 43, the hydraulic control check valve IV 38, the balance type normally-closed logic valve III 20 and the balance type normally-closed logic valve IV 53, so that the port b of the hydraulic control check valve III 43 and the hydraulic control check valve IV 38 is communicated with the port a, the port p of the balance type normally-closed logic valve III 20 and the balance type normally-closed logic valve IV 53 is communicated with the port a, and the rodless cavity of the auxiliary clamping roller hydraulic cylinder 19 at the driving side of the inlet 2# and the rodless cavity of the auxiliary clamping roller hydraulic cylinder 24 at the operating side of the inlet 2# are respectively communicated. Meanwhile, the electromagnet III 45 and the electromagnet IV 22 are powered on, so that the p port and the t port of the electromagnetic unloading valve III 16 and the electromagnetic unloading valve IV 21 are disconnected. At this time, the oil way enters a communicating and pressurized working state.

The third proportion electromagnet 42 and the fourth proportion electromagnet 33 input current signals, so that the p port/t port of the third proportion valve 44 and the fourth proportion valve 34 are communicated with the a port, and the pressing/lifting control of the rodless cavity of the oil cylinder is realized.

3. Outlet 1# auxiliary clamping roller loop

The port b of the hydraulic control one-way valve five 54 is connected with the pressure oil pipe P1, and the port a is connected with the port P of the proportional valve five 56; the port a of the proportional valve five 56 is connected with the port p of the balance type normally-closed logic valve five 57, and the port a of the balance type normally-closed logic valve five 57 is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 61 at the transmission side of the outlet No. 1 through a ball valve and a hose. The port b of the hydraulic control check valve six 93 is connected with the pressure oil pipe P1, and the port a is connected with the port P of the proportional valve six 92; the port a of the proportional valve six 92 is connected with the port p of the six 67 of the balance type normally closed logic valve, and the port a of the six 67 of the balance type normally closed logic valve is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 66 at the outlet 1# operation side through a ball valve and a hose. The T port of the fifth proportional valve 56 is connected with the fifth check valve 96 and is communicated with an oil return pipeline T. The T port of the proportional valve six 92 is connected with the one-way valve six 91 and is communicated with the oil return pipeline T. The P port of the electromagnetic reversing valve III 95 is connected with a main oil supply pipeline P1, the T port is connected with a main oil return pipeline T, and the a port is connected with a hydraulic control one-way valve V54, a hydraulic control one-way valve V93, a balance type normally-closed logic valve V57 and a control oil X port of the balance type normally-closed logic valve V67;

The electromagnet eleven 94 is electrified, so that the electromagnetic reversing valve III 95 is reversed, and the p port and the a port of the electromagnetic reversing valve III 95 are communicated. The port a of the electromagnetic directional valve III 95 is connected with the port a of the hydraulic control one-way valve V54, the hydraulic control one-way valve V93, the balance type normally-closed logic valve V57 and the control oil port x of the balance type normally-closed logic valve V67, so that the port b of the hydraulic control one-way valve V54 and the hydraulic control one-way valve V93 is communicated with the port a, the port p of the balance type normally-closed logic valve V57 and the balance type normally-closed logic valve V67 is communicated with the port a, and the rodless cavity of the auxiliary clamping roller hydraulic cylinder 61 at the outlet No. 1 transmission side and the rodless cavity of the auxiliary clamping roller hydraulic cylinder 66 at the outlet No. 1 operation side are respectively communicated. Meanwhile, the electromagnet five 58 and the electromagnet six 63 are powered on, so that the p port and the t port of the electromagnetic unloading valve five 59 and the electromagnetic unloading valve six 62 are disconnected. At this time, the oil way enters a communicating and pressurized working state.

The fifth proportional electromagnet 55 and the sixth proportional electromagnet 90 input current signals, so that the p port/t port of the fifth proportional valve 56 and the sixth proportional valve 92 are communicated with the a port, and the pressing/lifting control of the rodless cavity of the oil cylinder is realized.

4. Outlet 2# auxiliary clamping roller loop

The port b of the hydraulic control check valve seven 89 is connected with the pressure oil pipe P1, the port a of the hydraulic control check valve seven 89 is connected with the port P of the proportional valve seven 83, the port a of the proportional valve seven 83 is connected with the port P of the balance type normally closed logic valve seven 73, and the port a of the balance type normally closed logic valve seven 73 is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 71 at the transmission side of the outlet No. 2 through a ball valve and a hose. The port b of the hydraulic control check valve eight 84 is connected with the pressure oil pipe P1, the port a of the hydraulic control check valve eight 84 is connected with the port P of the proportional valve eight 81, the port a of the proportional valve eight 81 is connected with the port P of the eight 79 of the balance normally closed logic valve, and the port a of the eight 79 of the balance normally closed logic valve is connected with the rodless cavity of the auxiliary clamping roller hydraulic cylinder 74 at the outlet 2# operation side through a ball valve and a hose.

The twelve electromagnets 86 are electrified, so that the electromagnetic reversing valve IV 87 is reversed, and the p port and the a port of the electromagnetic reversing valve IV 87 are communicated. The port a of the electromagnetic directional valve IV 87 is connected with the control oil port x of the hydraulic control one-way valve seven 89, the hydraulic control one-way valve eight 84, the balance type normally-closed logic valve seven 73 and the balance type normally-closed logic valve eight 79, so that the port b of the hydraulic control one-way valve seven 89 and the hydraulic control one-way valve eight 84 is communicated with the port a, the port p of the balance type normally-closed logic valve seven 73 and the balance type normally-closed logic valve eight 79 is communicated with the port a, and the rodless cavity of the auxiliary clamping roller hydraulic cylinder 71 at the outlet 2# transmission side and the rodless cavity of the auxiliary clamping roller hydraulic cylinder 74 at the outlet 2# operation side are respectively communicated. Meanwhile, the electromagnet seven 69 and the electromagnet eight 78 are powered on, so that the p port and the t port of the electromagnetic unloading valve seven 68 and the electromagnetic unloading valve eight 77 are disconnected. At this time, the oil way enters a communicating and pressurized working state.

The proportional electromagnet seven 82 and the proportional electromagnet eight 80 input current signals, so that the p port/t port of the proportional valve seven 83 and the p port/t port of the proportional valve eight 81 are communicated with the a port, and the depressing/lifting control of the oil cylinder is realized.

5. Back pressure control loop of auxiliary clamping roller

The port b of the balance valve I10, the port b of the balance valve II 14, the port b of the balance valve III 18, the port b of the balance valve IV 23, the port b of the balance valve V97, the port b of the balance valve VI 65, the port b of the balance valve V70 and the port b of the balance valve V75 are converged into an oil path through a ball valve and a rubber pipe, and are communicated with the port a of the electromagnetic directional valve V28 and the pressure sensor V26. The p port of the electromagnetic directional valve five 28 is communicated with the a port of the three-way proportional pressure reducing valve 32, the p port of the overflow valve 30, the b port of the one-way valve ten 36 and the p port of the accumulator 29. The P port of the three-way proportional pressure reducing valve 32 is connected with a valve table total pressure oil pipe P1, and the T port is communicated with an oil return pipeline T through a one-way valve nine 35. The T port of the relief valve 30 and the T port of the accumulator 29 are connected back to the valve stand main return line T. The port a of the check valve ten 36 is communicated with an oil return pipeline T.

When the electromagnet thirteen 27 is not electrified, the port a and the port p of the electromagnetic directional valve five 28 are communicated. The p port of the electromagnetic directional valve five 28 is connected with the p port of the relief valve 30, the p port of the accumulator 29, the a port of the three-way proportional pressure reducing valve 32 and the b port of the one-way valve ten 36. When the set value is not reached, the p port and the t port of the relief valve 30 are disconnected. The P port of the three-way proportional pressure reducing valve 32 is connected with a valve table total pressure oil pipe P1, and the T port is communicated with a valve table main oil return pipe T through a one-way valve nine 35.

When the hydraulic cylinder moves up and down, oil in the rod cavity of the oil cylinder flowing through the port b of the balance valve I10, the port b of the balance valve II 14, the port b of the balance valve III 18, the port b of the balance valve IV 23, the port b of the balance valve V97, the port b of the balance valve VI 65, the port b of the balance valve V70 and the port b of the balance valve V75 completes oil supply and oil discharge in the converging pipeline. When the pressure reaches the set value of the three-way proportional pressure reducing valve 32, the port a and the port T of the three-way proportional pressure reducing valve 32 are communicated, oil returns to the main oil return pipe T of the valve table through a one-way valve nine 35, oil discharge is realized, and the pressing action of the auxiliary clamping roller is completed; when the pressure is lower than the set value of the three-way proportional pressure reducing valve 32, the p port and the a port of the three-way proportional pressure reducing valve 32 are communicated, oil supply is realized, and the lifting action of the auxiliary clamping roller is completed. The magnitude of the auxiliary clamping roller pressing force and the position control of the pressing roller are realized by controlling a proportional valve through an automatic system, so that the large pressing, the light pressing and the clamping functions of a casting blank are realized together with a large pressing rolling mill.

When ultrahigh pressure occurs under the pressing state of the auxiliary clamping roller, pressure overflow is firstly set by springs of the first electromagnetic unloading valve 6, the second electromagnetic unloading valve 8, the third electromagnetic unloading valve 16, the fourth electromagnetic unloading valve 21, the fifth electromagnetic unloading valve 59, the sixth electromagnetic unloading valve 62, the seventh electromagnetic unloading valve 68 and the eighth electromagnetic unloading valve 77 for protecting equipment. At this time, the no-bar chamber of the inlet 1# transmission side auxiliary clamping roller hydraulic cylinder 11, the inlet 1# operation side auxiliary clamping roller hydraulic cylinder 15, the inlet 2# transmission side auxiliary clamping roller hydraulic cylinder 19, the inlet 2# operation side auxiliary clamping roller hydraulic cylinder 24, the outlet 1# transmission side auxiliary clamping roller hydraulic cylinder 61, the outlet 1# operation side auxiliary clamping roller hydraulic cylinder 66, the outlet 2# transmission side auxiliary clamping roller hydraulic cylinder 71, and the outlet 2# operation side auxiliary clamping roller hydraulic cylinder 74 is in a high-pressure state. If the pressure continues to rise, the pressure reaches the set values of the first pressure sensor 9, the second pressure sensor 13, the third pressure sensor 17, the fourth pressure sensor 25, the fifth pressure sensor 60, the sixth pressure sensor 64, the seventh pressure sensor 72 and the eighth pressure sensor 76 respectively, and the corresponding electromagnet I5, electromagnet II 8, electromagnet III 45, electromagnet IV 22, electromagnet V58, electromagnet VI 63, electromagnet III 69 and electromagnet eighth 78 are controlled to lose power respectively, so that the corresponding electromagnetic unloading valve I6, electromagnetic unloading valve II 8, electromagnetic unloading valve III 16, electromagnetic unloading valve IV 21, electromagnetic unloading valve V59, electromagnetic unloading valve VI 62, electromagnetic unloading valve V68 and electromagnetic unloading valve V77 are decompressed, and the corresponding auxiliary clamping roller is lifted.

In the normal production process, when the hydraulic system fails, the hydraulic oil cannot be normally supplied, and the oil supplied by the main oil supply pipe accumulator of the hydraulic station can ensure that 4 groups of auxiliary clamping rollers are lifted up under the condition of large pressure, so that a casting blank can smoothly pass through until the casting of the steel is finished. The accumulator 29 absorbs the shock caused by the pressure fluctuation.

The pressure sensor one 9 realizes the detection pressure sensor two 13 of the rodless cavity oil supply pressure of the inlet 1# transmission side auxiliary clamping roller hydraulic cylinder 11, the detection pressure sensor three 17 of the rodless cavity oil supply pressure of the inlet 1# operation side auxiliary clamping roller hydraulic cylinder 15, the detection pressure sensor four 25 of the rodless cavity oil supply pressure of the inlet 2# transmission side auxiliary clamping roller hydraulic cylinder 19, the detection pressure sensor five 60 of the rodless cavity oil supply pressure of the inlet 2# operation side auxiliary clamping roller hydraulic cylinder 24, the detection pressure sensor six 64 of the rodless cavity oil supply pressure of the outlet 1# transmission side auxiliary clamping roller hydraulic cylinder 61, the detection pressure sensor seven 72 of the rodless cavity oil supply pressure of the outlet 1# operation side auxiliary clamping roller hydraulic cylinder 66, the detection pressure sensor eight 76 of the rodless cavity oil supply pressure of the outlet 2# operation side auxiliary clamping roller hydraulic cylinder 74, and the detection pressure sensor nine 26 of the rodless cavity oil supply pressure of all auxiliary clamping roller hydraulic cylinders.

Claims

1. The utility model provides a continuous casting billet large reduction rolling mill auxiliary clamping roller hydraulic control valve platform which characterized in that includes:

An inlet 1# transmission side auxiliary clamping roller hydraulic cylinder (11), a one-way valve I (52), a hydraulic control one-way valve I (1), a proportional valve I (3), a balance type normally closed logic valve I (4), an electromagnetic unloading valve I (6), a pressure sensor I (9) and a balance valve I (10); an auxiliary clamping roller hydraulic cylinder (15) at the inlet No. 1 operation side, a second check valve (46), a second hydraulic control check valve (48), a second proportional valve (51), a second balance normally closed logic valve (12), a second electromagnetic unloading valve (8), a second pressure sensor (13) and a second balance valve (14); an electromagnetic directional valve I (50);

An inlet 2# transmission side auxiliary clamping roller hydraulic cylinder (19), a check valve III (41), a hydraulic control check valve III (43), a proportional valve III (44), a balance type normally closed logic valve III (20), an electromagnetic unloading valve III (16), a pressure sensor III (17) and a balance valve III (18); an auxiliary clamping roller hydraulic cylinder (24) at the inlet 2# operation side, a check valve IV (37), a hydraulic control check valve IV (38), a proportional valve IV (34), a balance type normally closed logic valve IV (53), an electromagnetic unloading valve IV (21), a pressure sensor IV (25) and a balance valve IV (23); a second electromagnetic reversing valve (40);

The auxiliary clamping roller hydraulic cylinder at the transmission side of the outlet No.1 is provided with a hydraulic cylinder (61), a check valve five (96), a hydraulic control check valve five (54), a proportional valve five (56), a balance type normally closed logic valve five (57), an electromagnetic unloading valve five (59), a pressure sensor five (60) and a balance valve five (97); an outlet 1# operation side auxiliary clamping roller hydraulic cylinder (66), a check valve six (91), a hydraulic control check valve six (93), a proportional valve six (92), a balance type normally closed logic valve six (67), an electromagnetic unloading valve six (62), a pressure sensor six (64) and a balance valve six (65); electromagnetic directional valve III (95);

An outlet 2# transmission side auxiliary clamping roller hydraulic cylinder (71), a one-way valve seven (88), a hydraulic control one-way valve seven (89), a proportional valve seven (83), a balance type normally closed logic valve seven (73), an electromagnetic unloading valve seven (68), a pressure sensor seven (72) and a balance valve seven (70); an outlet 2# operation side auxiliary clamping roller hydraulic cylinder (74), a one-way valve eight (85), a hydraulic control one-way valve eight (84), a proportional valve eight (81), a balance type normally closed logic valve eight (79), an electromagnetic unloading valve eight (77), a pressure sensor eight (76) and a balance valve eight (75); a fourth electromagnetic directional valve (87);

A pressure sensor nine (26), an electromagnetic reversing valve five (28), an energy accumulator (29), an overflow valve (30), a three-way proportional pressure reducing valve (32), a one-way valve nine (35) and a one-way valve ten (36);

The port b of the first hydraulic control check valve (1) is connected with the pressure oil pipe P1, and the port a of the first hydraulic control check valve (1) is connected with the port P of the first proportional valve (3); the port a of the proportional valve I (3) is connected with the port p of the balance normally closed logic valve I (4); the port a of the balance type normally closed logic valve I (4) is communicated with the port p of the electromagnetic unloading valve I (6) and the pressure sensor I (9), and is connected with a rodless cavity of the auxiliary clamping roller hydraulic cylinder (11) at the inlet No. 1 transmission side through a ball valve and a hose; the T port of the proportional valve I (3) is connected with the one-way valve I (52) and is communicated with an oil return pipeline T; the T port of the electromagnetic unloading valve I (6) is communicated with an oil return pipeline T;

The port b of the second hydraulic control check valve (48) is connected with the pressure oil pipe P1, and the port a of the second hydraulic control check valve (48) is connected with the port P of the second proportional valve (51); an a port of the proportional valve II (51) is connected with a p port of the balance type normally closed logic valve II (12); the port a of the balance type normally closed logic valve II (12) is communicated with the port p of the electromagnetic unloading valve II (8) and the pressure sensor II (13), and is connected with a rodless cavity of the auxiliary clamping roller hydraulic cylinder (15) at the inlet No. 1 operation side through a ball valve and a hose; the T port of the second proportional valve (51) is connected with the second check valve (46) and is communicated with an oil return pipeline T; the T port of the electromagnetic unloading valve II (8) is communicated with an oil return pipeline T;

The P port of the electromagnetic reversing valve I (50) is connected with a main oil supply pipeline P1, the T port of the hydraulic control one-way valve II (48) is connected with a main oil return pipeline T, and the a port of the hydraulic control one-way valve II (48) is connected with the control oil x port of the hydraulic control one-way valve I (1), the hydraulic control one-way valve II (48), the balance normally-closed logic valve I (4) and the balance normally-closed logic valve II (12); the oil drain Y ports of the first hydraulic control check valve (1), the second hydraulic control check valve (48), the first balance normally-closed logic valve (4) and the second balance normally-closed logic valve (12) are connected with the valve table total oil drain pipe Y1 in a summarizing way;

the port b of the hydraulic control one-way valve III (43) is connected with the pressure oil pipe P1, and the port a of the hydraulic control one-way valve III (43) is connected with the port P of the proportional valve III (44); the port a of the proportional valve III (44) is connected with the port p of the balance normally-closed logic valve III (20); an a port of the balance type normally closed logic valve III (20) is communicated with a p port of the electromagnetic unloading valve III (16) and a pressure sensor III (17), and is connected with a rodless cavity of an auxiliary clamping roller hydraulic cylinder (19) at the inlet No. 2 transmission side through a ball valve and a hose; the T port of the proportional valve III (44) is connected with the one-way valve III (41) and is communicated with an oil return pipeline T; the T port of the electromagnetic unloading valve III (16) is communicated with an oil return pipeline T;

the port b of the hydraulic control one-way valve IV (38) is connected with the pressure oil pipe P1, and the port a of the hydraulic control one-way valve IV (38) is connected with the port P of the proportional valve IV (34); an a port of the proportional valve IV (34) is connected with a p port of the balance normally closed logic valve IV (53); an a port of the balance type normally closed logic valve IV (53) is communicated with a p port of the electromagnetic unloading valve IV (21) and a pressure sensor IV (25), and is connected with a rodless cavity of the auxiliary clamping roller hydraulic cylinder (24) at the inlet No. 2 operation side through a ball valve and a hose; the T port of the proportional valve IV (34) is connected with the check valve IV (37) and is communicated with an oil return pipeline T; the T port of the electromagnetic unloading valve IV (21) is communicated with an oil return pipeline T;

The P port of the electromagnetic directional valve II (40) is connected with a main oil supply pipeline P1, the T port of the electromagnetic directional valve II (40) is connected with a main oil return pipeline T, and the a port of the electromagnetic directional valve II (40) is connected with the control oil x port of the hydraulic control one-way valve III (43), the hydraulic control one-way valve IV (38), the balance type normally closed logic valve III (20) and the balance type normally closed logic valve IV (53); the oil drain Y ports of the third hydraulic control check valve (43), the fourth hydraulic control check valve (38), the third balance normally-closed logic valve (20) and the fourth balance normally-closed logic valve (53) are connected with the valve table total oil drain pipe Y1 in a summarizing way;

the port b of the hydraulic control one-way valve five (54) is connected with the pressure oil pipe P1, and the port a of the hydraulic control one-way valve five (54) is connected with the port P of the proportional valve five (56); the port a of the proportional valve five (56) is connected with the port p of the balance normally-closed logic valve five (57); the port a of the balance type normally closed logic valve five (57) is communicated with the port p of the electromagnetic unloading valve five (59) and the pressure sensor five (60), and is connected with a rodless cavity of an auxiliary clamping roller hydraulic cylinder (61) at the transmission side of the outlet No.1 through a ball valve and a hose; the T port of the proportional valve five (56) is connected with the check valve five (96) and is communicated with an oil return pipeline T; the T port of the electromagnetic unloading valve five (59) is communicated with an oil return pipeline T;

the port b of the hydraulic control check valve six (93) is connected with the pressure oil pipe P1, and the port a of the hydraulic control check valve six (93) is connected with the port P of the proportional valve six (92); an a port of the proportional valve six (92) is connected with a p port of the balance normally-closed logic valve six (67); the port a of the balance type normally closed logic valve six (67) is communicated with the port p of the electromagnetic unloading valve six (62) and the pressure sensor six (64), and is connected with a rodless cavity of the auxiliary clamping roller hydraulic cylinder (66) at the outlet No.1 operation side through a ball valve and a hose; the port T of the proportional valve six (92) is connected with the check valve six (91) and is communicated with an oil return pipeline T; the T port of the electromagnetic unloading valve six (62) is communicated with an oil return pipeline T;

The P port of the electromagnetic directional valve III (95) is connected with a main oil supply pipeline P1, the T port of the electromagnetic directional valve III (95) is connected with a main oil return pipeline T, and the a port of the electromagnetic directional valve III (95) is connected with the control oil x port of the hydraulic control one-way valve V (54), the hydraulic control one-way valve V (93), the balance type normally-closed logic valve V (57) and the balance type normally-closed logic valve V (67); the hydraulic control check valve five (54), the hydraulic control check valve six (93), the balance type normally closed logic valve five (57) and the drain port Y of the balance type normally closed logic valve six (67) are connected with the valve table total drain pipe Y1 in a summarizing way;

the port b of the hydraulic control one-way valve seven (89) is connected with a pressure oil pipe P1, and the port a of the electromagnetic reversing valve three (95) is connected with the port P of the proportional valve seven (83); an a port of the proportional valve seven (83) is connected with a p port of the balance normally closed logic valve seven (73); an a port of the balance type normally closed logic valve seven (73) is communicated with a p port of the electromagnetic unloading valve seven (68) and a pressure sensor seven (72), and is connected with a rodless cavity of an auxiliary clamping roller hydraulic cylinder (71) at the transmission side of the outlet No. 2 through a ball valve and a hose; the T port of the proportional valve seven (83) is connected with the one-way valve seven (88) and is communicated with an oil return pipeline T; the T port of the electromagnetic unloading valve seven (68) is communicated with an oil return pipeline T;

The port b of the hydraulic control one-way valve eight (84) is connected with the pressure oil pipe P1, and the port a of the hydraulic control one-way valve eight (84) is connected with the port P of the proportional valve eight (81); an a port of the proportional valve eight (81) is connected with a p port of the balance normally closed logic valve eight (79); the port a of the balance type normally closed logic valve eight (79) is communicated with the port p of the electromagnetic unloading valve eight (77) and the pressure sensor eight (76), and is connected with a rodless cavity of the auxiliary clamping roller hydraulic cylinder (74) at the outlet 2# operation side through a ball valve and a hose; the T port of the proportional valve eight (81) is connected with the one-way valve eight (85) and is communicated with an oil return pipeline T; the T port of the electromagnetic unloading valve eight (77) is communicated with an oil return pipeline T;

the P port of the electromagnetic reversing valve IV (87) is connected with a main oil supply pipeline P1, the T port of the hydraulic control one-way valve V (84) is connected with a main oil return pipeline T, and the a port of the hydraulic control one-way valve V (84) is connected with the control oil x port of the hydraulic control one-way valve V (89), the hydraulic control one-way valve V (84), the balance normally-closed logic valve V (73) and the balance normally-closed logic valve V (79); the hydraulic control one-way valve seven (89), the hydraulic control one-way valve eight (84), the balance type normally closed logic valve seven (73) and the oil drain Y port of the balance type normally closed logic valve eight (79) are connected with the valve table total oil drain pipe Y1 in a summarizing way;

The rod cavity of the auxiliary clamping roller hydraulic cylinder (11) at the inlet 1# transmission side is communicated with the port a of the balance valve I (10), and the rod cavity of the auxiliary clamping roller hydraulic cylinder (15) at the inlet 1# operation side is communicated with the port a of the balance valve II (14); the hydraulic cylinder (19) of the auxiliary clamping roller at the inlet No. 2 transmission side is provided with a rod cavity which is communicated with an a port of a balance valve III (18); the hydraulic cylinder (24) of the auxiliary clamping roller at the inlet 2# operation side is provided with a rod cavity which is communicated with an a port of a balance valve IV (23); the hydraulic cylinder (61) of the auxiliary clamping roller at the transmission side of the outlet No. 1 is provided with a rod cavity which is communicated with an a port of a balance valve five (97); the hydraulic cylinder (66) of the auxiliary clamping roller at the outlet 1# operation side is provided with a rod cavity which is communicated with an a port of a balance valve six (65); the rod cavity of the auxiliary clamping roller hydraulic cylinder (71) at the outlet 2# transmission side is communicated with the a port of the balance valve seven (70), and the rod cavity of the auxiliary clamping roller hydraulic cylinder (74) at the outlet 2# operation side is communicated with the a port of the balance valve eight (75);

the b port of the balance valve I (10), the b port of the balance valve II (14), the b port of the balance valve III (18), the b port of the balance valve IV (23), the b port of the balance valve V (97), the b port of the balance valve VI (65), the b port of the balance valve V (70) and the b port of the balance valve V (75) are combined into an oil way through a ball valve and a rubber pipe, and are communicated with the a port of the electromagnetic reversing valve V (28) and the pressure sensor V (26); the p port of the electromagnetic reversing valve five (28) is communicated with the a port of the three-way proportional pressure reducing valve (32), the p port of the overflow valve (30), the b port of the one-way valve ten (36) and the p port of the energy accumulator (29); the P port of the three-way proportional pressure reducing valve (32) is connected with a valve table total pressure oil pipe P1, and the T port of the three-way proportional pressure reducing valve (32) is communicated with an oil return pipeline T through a one-way valve nine (35); the T port of the overflow valve (30) and the T port of the energy accumulator (29) are connected back to the main oil return pipe T of the valve table; an a port of the check valve ten (36) is communicated with an oil return pipeline T;

the first pressure sensor (9), the second pressure sensor (13), the third pressure sensor (17), the fourth pressure sensor (25), the fifth pressure sensor (60), the sixth pressure sensor (64), the seventh pressure sensor (72), the eighth pressure sensor (76) and the ninth pressure sensor (26) are mechanical sensors;

The proportional valve I (3), the proportional valve II (51), the proportional valve III (44), the proportional valve IV (34), the proportional valve V (56), the proportional valve VI (92), the proportional valve V (83) and the proportional valve V (81) are direct-acting, current-controlled, three-position and four-way, a proportional electromagnet and a directional valve;

The balance type normally-closed logic valve I (4), the balance type normally-closed logic valve II (12), the balance type normally-closed logic valve III (20), the balance type normally-closed logic valve IV (53), the balance type normally-closed logic valve V (57), the balance type normally-closed logic valve VI (67), the balance type normally-closed logic valve V (73) and the balance type normally-closed logic valve V (79) are 2-bit 2-way, hydraulic control and normally-closed logic valves.

2. The valve table according to claim 1, wherein the first pilot-operated check valve (1), the second pilot-operated check valve (48), the third pilot-operated check valve (43), the fourth pilot-operated check valve (38), the fifth pilot-operated check valve (54), the sixth pilot-operated check valve (93), the seventh pilot-operated check valve (89) and the eighth pilot-operated check valve (84) are external-control leakage pilot-operated check valves.

3. The valve stand according to claim 1, wherein the electromagnetic directional valve five (28) is a 2-position 2-way directional valve.

4. The valve table according to claim 1, wherein the first electromagnetic directional valve (50), the second electromagnetic directional valve (40), the third electromagnetic directional valve (95) and the fourth electromagnetic directional valve (87) are 2-position 4-way directional valves.

5. The valve table according to claim 1, wherein the first electromagnetic unloading valve (6), the second electromagnetic unloading valve (8), the third electromagnetic unloading valve (16), the fourth electromagnetic unloading valve (21), the fifth electromagnetic unloading valve (59), the sixth electromagnetic unloading valve (62), the seventh electromagnetic unloading valve (68) and the eighth electromagnetic unloading valve (77) are normally open unloading valves.

6. Valve table according to claim 1, characterized in that the overflow valve (30) is a direct acting overflow valve.

7. The valve table according to claim 1, wherein the three-way proportional pressure reducing valve (32) is a three-way, proportional solenoid, current controlled pressure reducing valve.