CN112032119A

CN112032119A - Hydraulic control valve table for auxiliary clamping roller of rolling mill under large press of continuous casting billet

Info

Publication number: CN112032119A
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: 2020-12-04
Anticipated expiration: 2040-09-19
Also published as: CN112032119B

Abstract

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

Description

Hydraulic control valve table for auxiliary clamping roller of rolling mill under large press of continuous casting billet

Technical Field

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

Background

The large reduction technology of the solidification tail end of the continuous casting billet is developed based on the small reduction technology of the solidification tail end, and is suitable for the next generation of continuous casting new technology of the continuous casting billet with large section.

The purpose of adopting the technology of solidifying the tail end under high pressure is as follows: aiming at the problem of loosening defect which is often caused by rolling an extra-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 cast blank and ensure the quality of a steel plate core by a large rolling compression ratio (not less than 4-5). The large reduction technology for the solidification tail end of the continuous casting blank is characterized in that a pair of large-diameter rollers is adopted to implement large reduction (more than or equal to 10mm) at the solidification tail end of a slab, so that metal flow deformation and feeding (filling shrinkage holes and looseness generated by solidification shrinkage) are generated in the center of the casting blank, the defect of looseness in the center of the casting blank is obviously improved or eliminated, the density of the casting blank is improved, and stable production of thick plates and large-specification sections under the condition of low rolling compression ratio is realized.

At present, the technical practice cases under large reduction at the solidification end of the continuous casting slab are mainly in Japan and Korea. The state has also carried out the technological practice of high reduction in the tang steel middle plate factory, the reduction form is sector reduction. The domestic rolling mill type high reduction technology is still in the research stage. The Beijing university of science and technology makes prospective research on the large reduction technology of the solidification tail end of a continuous casting slab, and obtains a plurality of patents about the large reduction technology. The first-steel international engineering technology company and Beijing university of science and technology cooperate to perform engineering application on related research results for the first time, and the related research results are applied to the project of No. 1 slab caster in the second-stage steelmaking and continuous casting project of Jingtang.

The method is characterized in that a sector section of the Jingtang second-stage 1# slab continuous casting machine is upgraded and transformed into novel equipment with a high reduction function, and a high reduction technology is implemented by adjusting the solidification tail end of a casting blank of a cooling system of the continuous casting machine. However, the realization of the large reduction technology not only needs the control of the reduction hydraulic cylinder of the large reduction rolling mill, but also has the important importance on the hydraulic control of the auxiliary clamping rolls of the rolling mill inlet 2 group and the auxiliary clamping rolls of the rolling mill outlet 2 group. The inlet 1# auxiliary clamping roller, the inlet 2# auxiliary clamping roller are arranged at the inlet of the rolling mill under the large pressure, the outlet 1# auxiliary clamping roller and the outlet 2# auxiliary clamping roller are arranged at the outlet of the rolling mill under the large pressure. The inlet 1# auxiliary grip roller is controlled by an inlet 1# drive side auxiliary grip roller hydraulic cylinder and an inlet 1# operation side auxiliary grip roller hydraulic cylinder. The inlet 2# auxiliary grip roller is controlled by an inlet 2# drive side auxiliary grip roller hydraulic cylinder and an inlet 2# operation side auxiliary grip roller hydraulic cylinder. The outlet 1# auxiliary grip roller is controlled by an outlet 1# drive side auxiliary grip roller hydraulic cylinder and an outlet 1# operation side auxiliary grip roller hydraulic cylinder. The outlet 2# auxiliary nip roller is controlled by an outlet 2# drive side auxiliary nip roller hydraulic cylinder and an outlet 2# operation side auxiliary nip roller hydraulic cylinder. The auxiliary nip roll hydraulic cylinder is primarily pressure and position controlled. Each group of auxiliary clamping roller hydraulic cylinders can independently realize pressing and lifting. At present, no intellectual property and technical standard of a continuous casting billet hydraulic control technology under high pressure in a common control mode of 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 blank high reduction rolling mill, which improves or eliminates the defect of looseness of the center of a casting blank through a high reduction technology of the high reduction rolling mill, improves the compactness of the casting blank, and realizes the stable production of thick plates and large-size sectional materials under the condition of low rolling compression ratio. The pressure and the position of the oil cylinder are controlled by a full hydraulic pressure control loop, so that the requirements of controlling two main process parameters of the rolling force and the rolling reduction of the auxiliary clamping roller are met. The function of the rolling mill is that the rolling mill and the automatic control system are controlled together to realize the function of high reduction according to a control instruction sent by the tracking signal of the solidification tail end position of the casting blank; tracking the solidification position of the core part of the casting blank, and controlling a roll gap together with a high reduction rolling mill to realize a light reduction function; and tracking the solidification tail end position of the casting blank, and assisting the low-pressure clamping action of the clamping roller before and after the casting blank is completely solidified to realize the low-pressure clamping function.

The invention comprises the following steps:

the auxiliary clamping roller hydraulic cylinder 11 at the inlet 1# transmission side, a one-way valve I52, a hydraulic control one-way 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 inlet 1# operation side auxiliary clamping roller hydraulic cylinder 15, a second check valve 46, a second pilot-controlled check valve 48, a second proportional valve 51, a second balanced normally-closed logic valve 12, a second electromagnetic unloading valve 8, a second pressure sensor 13 and a second balance valve 14; a first electromagnetic directional valve 50;

the auxiliary clamping roller hydraulic cylinder 19 at the inlet 2# transmission side, 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 inlet 2# operation side auxiliary pinch roller hydraulic cylinder 24, a check valve four 37, a pilot operated check valve four 38, a proportional valve four 34, a balanced type normally closed logic valve four 53, an electromagnetic unloading valve four 21, a pressure sensor four 25, and a balance valve four 23; a second electromagnetic directional valve 40;

the hydraulic cylinder 61 of the auxiliary clamping roller at the 1# transmission side of the outlet, 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 grip roller hydraulic cylinder 66, a check valve six 91, a pilot operated check valve six 93, a proportional valve six 92, a balanced type normally closed logic valve six 67, an electromagnetic unloading valve six 62, a pressure sensor six 64, and a balance valve six 65; a third electromagnetic directional valve 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 pinch roller hydraulic cylinder 74, a check valve eight 85, a pilot operated check valve eight 84, a proportional valve eight 81, a balanced 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;

nine pressure sensors 26, five electromagnetic directional valves 28, an energy accumulator 29, an overflow valve 30, a three-way proportional pressure reducing valve 32, nine check valves 35 and ten check valves 36.

A port b of the hydraulic control one-way valve I1 is connected with a pressure oil pipe P1, and a port a is connected with a port P of the proportional valve I3; the port a of the first proportional valve 3 is connected with the port p of the first balanced type normally closed logic valve 4; and 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 inlet No. 1 transmission side auxiliary clamping roller hydraulic cylinder 11 through a ball valve and a hose. The T port of the first proportional valve 3 is connected with the first check valve 52 and communicated with the oil return pipeline T. A port T of the electromagnetic unloading valve I6 is communicated with an oil return pipeline T;

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

A port P of the first electromagnetic directional valve 50 is connected with a main oil supply pipeline P1, a port T of the first electromagnetic directional valve 50 is connected with a main oil return pipeline T, and a port a of the first electromagnetic directional valve 50 is connected with control oil ports x of the first hydraulic control one-way valve 1, the second hydraulic control one-way valve 48, the first balanced normally-closed logic valve 4 and the second balanced normally-closed logic valve 12; and the oil drainage Y ports of the first pilot-controlled check valve 1, the second pilot-controlled check valve 48, the first balanced normally-closed logic valve 4 and the second balanced normally-closed logic valve 12 are connected with a general oil drainage pipe Y1 of the valve table in a gathering manner.

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

A port b of the hydraulic control one-way valve IV 38 is connected with a pressure oil pipe P1, and a port a of the hydraulic control one-way valve IV 38 is connected with a port P of the proportional valve IV 34; the port a of the proportional valve four 34 is connected with the port p of the balanced type normally closed logic valve four 53; the port a of the balanced type normally closed logic valve four 53 communicates with the port p of the electromagnetic unloading valve four 21 and the pressure sensor four 25, and is connected to the rodless chamber of the inlet # 2 operation side auxiliary grip roller hydraulic cylinder 24 through a ball valve and a hose. A port T of the proportional valve IV 34 is connected with a one-way valve IV 37 and is communicated with an oil return pipeline T; and a port T of the electromagnetic unloading valve IV 21 is communicated with an oil return pipeline T.

A port P of the second electromagnetic directional valve 40 is connected with a main oil supply pipeline P1, a port T of the second electromagnetic directional valve 40 is connected with a main oil return pipeline T, and a port a of the second electromagnetic directional valve 40 is connected with control oil x ports of a third hydraulic control one-way valve 43, a fourth hydraulic control one-way valve 38, a third balanced normally-closed logic valve 20 and a fourth balanced normally-closed logic valve 53; and the oil drainage Y ports of the hydraulic control one-way valve III 43, the hydraulic control one-way valve IV 38, the balanced normally closed logic valve III 20 and the balanced normally closed logic valve IV 53 are connected with a valve table main oil drainage pipe Y1 in a summary mode.

A port b of the hydraulic control one-way valve five 54 is connected with a pressure oil pipe P1, and a port a of the hydraulic control one-way valve five 54 is connected with a port P of the proportional valve five 56; the port a of the five proportional valve 56 is connected with the port p of the five balanced type normally closed logic valve 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 the outlet 1# transmission side auxiliary clamping roller hydraulic cylinder 61 through a ball valve and a hose; a port T of the five proportional valve 56 is connected with a five one-way valve 96 and communicated with an oil return pipeline T; and a port T of the electromagnetic unloading valve five 59 is communicated with an oil return pipeline T.

A port b of the hydraulic control one-way valve six 93 is connected with a pressure oil pipe P1, and a port a of the hydraulic control one-way valve six 93 is connected with a 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 balanced type normally closed logic valve six 67; the port a of the balanced type normally closed logic valve six 67 communicates with the port p of the electromagnetic unloading valve six 62 and the pressure sensor six 64, and is connected to the rodless chamber of the outlet # 1 operation side auxiliary grip roller hydraulic cylinder 66 through a ball valve and a hose. And a port T of the proportional valve six 92 is connected with a check valve four-six 91 and communicated with an oil return pipeline T. And a port T of the electromagnetic unloading valve six 62 is communicated with the oil return pipeline T.

A port P of the third electromagnetic directional valve 95 is connected with a main oil supply pipeline P1, a port T of the third electromagnetic directional valve 95 is connected with a main oil return pipeline T, and a port a of the third electromagnetic directional valve 95 is connected with a port x of the hydraulic control one-way valve five 54, the hydraulic control one-way valve six 93, the balanced normally closed logic valve five 57 and the balanced normally closed logic valve six 67; and the oil drainage Y ports of the hydraulic control one-way valve five 54, the hydraulic control one-way 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 a valve table main oil drainage pipe Y1 in a summary mode.

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

A port b of the hydraulic control one-way valve eight 84 is connected with a pressure oil pipe P1, and a port a is connected with a 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 balanced type normally closed logic valve eight 79; the port a of the balanced type normally closed logic valve eight 79 communicates with the port p of the electromagnetic unloading valve eight 77 and the pressure sensor eight 76, and is connected to the rodless chamber of the outlet # 2 operation side auxiliary grip roller hydraulic cylinder 74 through a ball valve and a hose. And a port T of the proportional valve eight 81 is connected with a one-way valve eight 85 and communicated with the oil return pipeline T. And a port T of the electromagnetic unloading valve eight 77 is communicated with an oil return pipeline T.

A port P of the fourth electromagnetic directional valve 87 is connected with a main oil supply pipeline P1, a port T is connected with a main oil return pipeline T, and a port a is connected with control oil x ports of a pilot-controlled one-way valve seven 89, a pilot-controlled one-way valve eight 84, a balanced normally-closed logic valve seven 73 and a balanced normally-closed logic valve eight 79; and oil drainage Y ports 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 a valve table main oil drainage pipe Y1 in a summary mode.

A rod cavity of the inlet 1# transmission side auxiliary clamping roller hydraulic cylinder 11 is communicated with an a port of a first balance valve 10, and a rod cavity of the inlet 1# operation side auxiliary clamping roller hydraulic cylinder 15 is communicated with an a port of a second balance valve 14; a rod cavity of the inlet 2# transmission side auxiliary clamping roller hydraulic cylinder 19 is communicated with an a port of a balance valve III 18; the inlet 2# operation side auxiliary clamping roller hydraulic cylinder 24 is communicated with a rod cavity of a balancing valve IV 23 through a port a; a rod cavity of the hydraulic cylinder 61 of the auxiliary clamping roller at the transmission side of the outlet 1# is communicated with an a port of the balance valve five 97; the outlet 1# operation side auxiliary clamping roller hydraulic cylinder 66 is communicated with an a port of a balance valve six 65 through a rod cavity; the outlet 2# drive side auxiliary grip roller hydraulic cylinder 71 has a rod chamber communicating with the port a of the balance valve seven 70, and the outlet 2# operation side auxiliary grip roller hydraulic cylinder 74 has a rod chamber communicating with the port a of the balance valve eight 75.

The port b of the first balance valve 10, the port b of the second balance valve 14, the port b of the third balance valve 18, the port b of the fourth balance valve 23, the port b of the fifth balance valve 97, the port b of the sixth balance valve 65, the port b of the seventh balance valve 70 and the port b of the eighth balance valve 75 are converged into an oil path through ball valves and rubber pipes, and communicated with the port a of the fifth electromagnetic directional valve 28 and the pressure sensor nine 26; a port p of the electromagnetic directional valve five 28 is communicated with a port a of the three-way proportional pressure reducing valve 32, a port p of the overflow valve 30, a port b of the check valve ten 36 and a port p of the energy accumulator 29; a port P of the three-way proportional pressure reducing valve 32 is connected with a valve table total pressure oil pipe P1, and a port T of the three-way proportional pressure reducing valve 32 is communicated with an oil return pipeline T through a check 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 stand main oil return pipe T; the port a of the check valve ten 36 is communicated with the 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 VII 72, the pressure sensor VIII and the pressure sensor VII 26 have an analog quantity output function and are mechanical.

The hydraulic control one-way valve I1, the hydraulic control one-way valve II 48, the hydraulic control one-way valve III 43, the hydraulic control one-way valve IV 38, the hydraulic control one-way valve V54, the hydraulic control one-way valve VI 93, the hydraulic control one-way valve VII 89 and the hydraulic control one-way valve VIII 84 are external control external drainage control one-way valves.

The first proportional valve 3, the second proportional valve 51, the third proportional valve 44, the fourth proportional valve 34, the fifth proportional valve 56, the sixth proportional valve 92, the seventh proportional valve 83 and the eighth proportional valve 81 are of direct-acting type and are controlled by current, and the three-position four-way valve, the proportional electromagnet and the directional valve are arranged on the two sides of the valve body.

The five electromagnetic directional valves 28 are 2-position 2-way directional valves.

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.

The balanced normally closed logic valve I4, the balanced normally closed logic valve II 12, the balanced normally closed logic valve III 20, the balanced normally closed logic valve IV 53, the balanced normally closed logic valve V57, the balanced normally closed logic valve VI 67, the balanced normally closed logic valve VII 73 and the balanced normally closed logic valve VIII are 2-position 2-way, hydraulic control and normally closed logic valves.

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.

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 large reduction technology of the rolling mill is realized through hydraulic control of the auxiliary roller hydraulic valve table loop, so that the defect of looseness of the center of a casting blank is improved or eliminated, the density of the casting blank is improved, and stable production of a thick plate and a large-specification section 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 stand structure.

Fig. 2 is a continuation of fig. 1 a-a.

In the figure, an inlet 1# transmission side auxiliary clamping roller hydraulic cylinder 11, a one-way valve 52, a hydraulic control one-way valve 1, a proportional electromagnet 2, a proportional valve 3, a balance type normally closed logic valve 4, an electromagnet 5, an electromagnetic unloading valve 6, a pressure sensor 9 and a balance valve 10; the inlet 1# operation side auxiliary clamping roller hydraulic cylinder 15, a second check valve 46, a second pilot-controlled check valve 48, a second proportional electromagnet 47, a second proportional valve 51, a second balanced 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; nine electromagnets 49 and one electromagnetic directional valve 50.

The hydraulic control system comprises 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 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 inlet 2# operation side auxiliary clamping roller hydraulic cylinder 24, a check valve four 37, a pilot-controlled check valve four 38, a proportional electromagnet four 33, a proportional valve four 34, a balanced type normally closed logic valve four 53, an electromagnet four 22, an electromagnetic unloading valve four 21, a pressure sensor four 25 and a balance valve four 23; a electromagnet ten 39 and a second electromagnetic reversing valve 40.

The hydraulic cylinder 61 of the auxiliary clamping roller at the 1# transmission side of the outlet, 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; an outlet 1# operation side auxiliary pinch roller hydraulic cylinder 66, a check valve six 91, a pilot operated check valve six 93, a proportional electromagnet six 90, a proportional valve six 92, a balanced 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; eleven electromagnets 94, three electromagnetic directional valves 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 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 pinch roller hydraulic cylinder 74, a check valve eight 85, a pilot-controlled check valve eight 84, a proportional electromagnet eight 80, a proportional valve eight 81, a balanced type normally closed logic valve eight 79, an electromagnet eight 78, an electromagnetic unloading valve eight 77, a pressure sensor eight 76, and a balanced valve eight 75; twelve electromagnets 86 and four electromagnetic directional valves 87.

Nine pressure sensors 26, thirteen electromagnets 27, five electromagnetic directional valves 28, an energy accumulator 29, an overflow valve 30, nine proportional electromagnets 31, a three-way proportional pressure reducing valve 32, nine check valves 35 and ten check valves 36.

Detailed Description

The hydraulic control device comprises an inlet 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 inlet 1# operation side auxiliary clamping roller hydraulic cylinder 15, a second check valve 46, a second pilot-controlled check valve 48, a second proportional electromagnet 47, a second proportional valve 51, a second balanced 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; nine electromagnets 49 and one electromagnetic directional valve 50.

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

1. Inlet 1# auxiliary pinch roll loop

A port b of the hydraulic control one-way valve I1 is connected with a pressure oil pipe P1, and a port a is connected with a port P of the proportional valve I3; the port a of the first proportional valve 3 is connected with the port p of the first balanced type normally closed logic valve 4, and the port a of the first balanced type normally closed logic valve 4 is connected with the rodless cavity of the 1# transmission side auxiliary clamping roller hydraulic cylinder 11 through a ball valve and a hose. A port b of the second pilot-controlled check valve 48 is connected with a pressure oil pipe P1, and a port a is connected with a 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 balanced type normally closed logic valve 12, and the port a of the second balanced type normally closed logic valve 12 is connected into the rodless cavity of the port 1# operation side auxiliary nip roller hydraulic cylinder 15 through a ball valve and a hose. And a port T of the first proportional valve 3 is connected with the first check valve 52 and communicated with the oil return pipeline T. And a port T of the second proportional valve 51 is connected with the second check valve 46 and communicated with the oil return pipeline T. A port a is connected with a pilot oil x port of the pilot-operated check valve I1, a pilot-operated check valve II 48, the balanced normally-closed logic valve I4 and the balanced normally-closed logic valve II 12;

and the electromagnet nine 49 is electrified to enable the first electromagnetic directional valve 50 to be in direction change, and the port p of the first electromagnetic directional valve 50 is communicated with the port a. And the port a of the first electromagnetic directional valve 50 is connected with the pilot oil port x of the first pilot check valve 1, the second pilot check valve 48, the first balanced normally-closed logic valve 4 and the second balanced normally-closed logic valve 12, so that the ports b and a of the first pilot check valve 1 and the second pilot check valve 48 are communicated, the ports p and a of the first balanced normally-closed logic valve 4 and the second balanced normally-closed logic valve 12 are communicated, and a rodless cavity of the inlet 1# transmission side auxiliary clamping roller hydraulic cylinder 11 and a rodless cavity of the inlet 1# operation side auxiliary clamping roller hydraulic cylinder 15 are respectively communicated. Meanwhile, the first electromagnet 5 and the second electromagnet 7 are electrified, so that the p port and the t port of the first electromagnetic unloading valve 6 and the second electromagnetic unloading valve 8 are disconnected. At this time, the oil circuit enters a communication and pressure working state.

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

2. Inlet 2# auxiliary nip roll loop

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

and the electromagnet 39 is electrified to enable the second electromagnetic directional valve 40 to be directional, and the port p of the second electromagnetic directional valve 40 is communicated with the port a. And the port a of the second electromagnetic directional valve 40 is connected with the control oil port x of the third pilot-operated check valve 43, the fourth pilot-operated check valve 38, the third balanced normally-closed logic valve 20 and the fourth balanced normally-closed logic valve 53, so that the ports b and a of the third pilot-operated check valve 43 and the fourth pilot-operated check valve 38 are communicated, the ports p and a of the third balanced normally-closed logic valve 20 and the fourth balanced normally-closed logic valve 53 are communicated, and the rodless cavity of the inlet 2# transmission side auxiliary clamping roller hydraulic cylinder 19 and the rodless cavity of the inlet 2# operation side auxiliary clamping roller hydraulic cylinder 24 are respectively communicated. Meanwhile, the electromagnet three 45 and the electromagnet four 22 are electrified, so that the p port and the t port of the electromagnetic unloading valve three 16 and the electromagnetic unloading valve four 21 are disconnected. At this time, the oil circuit enters a communication and pressure working state.

And current signals are input into the third proportional electromagnet 42 and the fourth proportional electromagnet 33, so that the ports p/t and the ports a of the third proportional valve 44 and the fourth proportional valve 34 are communicated, and the depression/elevation control of the rodless cavity of the oil cylinder is realized.

3. Outlet 1# auxiliary pinch roll loop

A port b of the hydraulic control one-way valve five 54 is connected with a pressure oil pipe P1, and a port a is connected with a 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 outlet No. 1 transmission side auxiliary clamping roller hydraulic cylinder 61 through a ball valve and a hose. A port b of the hydraulic control one-way valve six 93 is connected with a pressure oil pipe P1, and a port a is connected with a 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 balanced type normally closed logic valve six 67, and the port a of the balanced type normally closed logic valve six 67 is connected with the rodless cavity of the outlet # 1 operation side auxiliary nip roller hydraulic cylinder 66 through a ball valve and a hose. And a port T of the five proportional valve 56 is connected with a five one-way valve 96 and communicated with the oil return pipeline T. The T port of the proportional valve six 92 is connected with the check valve six 91 and is communicated with the oil return pipeline T. A port P of the third electromagnetic directional valve 95 is connected with a main oil supply pipeline P1, a port T is connected with a main oil return pipeline T, and a port a is connected with a port x of a pilot-operated check valve five 54, a pilot-operated check valve six 93, a balanced normally-closed logic valve five 57 and a balanced normally-closed logic valve six 67;

the electromagnet eleven 94 is electrified to enable the electromagnetic directional valve III 95 to be directional, and the port p of the electromagnetic directional valve III 95 is communicated with the port a. And an a port of the electromagnetic directional valve III 95 is connected with a control oil x port of the hydraulic control one-way valve five 54, the hydraulic control one-way valve six 93, the balanced normally closed logic valve five 57 and the balanced normally closed logic valve six 67, so that b ports of the hydraulic control one-way valve five 54 and the hydraulic control one-way valve six 93 are communicated with the a port, p ports of the balanced normally closed logic valve five 57 and the balanced normally closed logic valve six 67 are communicated with the a port, and a rodless cavity of the outlet 1# transmission side auxiliary clamping roller hydraulic cylinder 61 and a rodless cavity of the outlet 1# operation side auxiliary clamping roller hydraulic cylinder 66 are respectively communicated. Meanwhile, the five electromagnets 58 and the six electromagnets 63 are electrified, so that the p port and the t port of the five electromagnetic unloading valves 59 and the six electromagnetic unloading valves 62 are disconnected. At this time, the oil circuit enters a communication and pressure working state.

And current signals are input into the five proportional electromagnets 55 and the six proportional electromagnets 90, so that the p port/t port and the a port of the five proportional valves 56 and the six proportional valves 92 are communicated, and the depression/elevation control of the rodless cavity of the oil cylinder is realized.

4. Outlet 2# auxiliary pinch roll loop

The b port of the pilot-controlled check valve seven 89 is connected with a pressure oil pipe P1, the a port of the pilot-controlled check valve seven 89 is connected with the P port of the proportional valve seven 83, the a port of the proportional valve seven 83 is connected with the P port of the balanced type normally closed logic valve seven 73, and the a port of the balanced type normally closed logic valve seven 73 is connected with the rodless cavity of the 2# transmission side auxiliary clamping roller hydraulic cylinder 71 through a ball valve and a hose. The b port of the pilot operated check valve eight 84 is connected with a pressure oil pipe P1, the a port of the pilot operated check valve eight 84 is connected with the P port of the proportional valve eight 81, the a port of the proportional valve eight 81 is connected with the P port of the balanced type normally closed logic valve eight 79, and the a port of the balanced type normally closed logic valve eight 79 is connected with the rodless cavity of the outlet 2# operation side auxiliary clamping roller hydraulic cylinder 74 through a ball valve and a hose.

The electromagnet twelve 86 is electrified to change the direction of the electromagnetic directional valve four 87, and the port p of the electromagnetic directional valve four 87 is communicated with the port a. The port a of the electromagnetic directional valve four 87 is connected with the control oil port x of the pilot-operated check valve seven 89, the pilot-operated check valve eight 84, the balanced normally-closed logic valve seven 73 and the balanced normally-closed logic valve eight 79, so that the ports b and a of the pilot-operated check valve seven 89 and the pilot-operated check valve eight 84 are communicated, the ports p and a of the balanced normally-closed logic valve seven 73 and the balanced normally-closed logic valve eight 79 are communicated, and the rodless cavity of the outlet 2# transmission side auxiliary grip roller hydraulic cylinder 71 and the rodless cavity of the outlet 2# operation side auxiliary grip roller hydraulic cylinder 74 are respectively communicated. Meanwhile, the electromagnet seven 69 and the electromagnet eight 78 are electrified, 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 circuit enters a communication and pressure working state.

The seven 82 and eight 80 proportional electromagnets input current signals to connect the p/t ports and the a ports of the seven 83 and eight 81 proportional valves, so as to realize the press-down/lift-up control of the oil cylinder.

5. Auxiliary clamping roller backpressure control loop

The port b of the first balance valve 10, the port b of the second balance valve 14, the port b of the third balance valve 18, the port b of the fourth balance valve 23, the port b of the fifth balance valve 97, the port b of the sixth balance valve 65, the port b of the seventh balance valve 70 and the port b of the eighth balance valve 75 are merged into an oil path through ball valves and rubber pipes, and the oil path is communicated with the port a of the fifth electromagnetic directional valve 28 and the pressure sensor nine 26. The port p of the electromagnetic directional valve five 28 is communicated with the port a of the three-way proportional pressure reducing valve 32, the port p of the overflow valve 30, the port b of the check valve ten 36 and the port p of the accumulator 29. The port P of the three-way proportional pressure reducing valve 32 is connected with a valve table total pressure oil pipe P1, and the port T is communicated with an oil return pipeline T through a check 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 pipe T. The port a of the check valve ten 36 is communicated with the oil return pipeline T.

When the electromagnet thirteen 27 is not electrified, the port a of the electromagnetic directional valve five 28 is communicated with the port p. The port p of the electromagnetic directional valve five 28 is simultaneously connected with the port p of the overflow valve 30, the port p of the accumulator 29, the port a of the three-way proportional pressure reducing valve 32 and the port b of the check valve ten 36. When the pressure does not reach the set value, the port p and the port t 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 does lifting movement, oil in the rod cavity of the oil cylinder, which flows through the port b of the first balance valve 10, the port b of the second balance valve 14, the port b of the third balance valve 18, the port b of the fourth balance valve 23, the port b of the fifth balance valve 97, the port b of the sixth balance valve 65, the port b of the seventh balance valve 70 and the port b of the eighth balance valve 75, is supplied and discharged in a confluence 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, and oil returns to a main oil return pipe T of the valve table through a nine 35 one-way valve to realize oil discharge and complete the pressing action of the auxiliary clamping roller; when the pressure is lower than the set value of the three-way proportional pressure reducing valve 32, the port p of the three-way proportional pressure reducing valve 32 is communicated with the port a, so that oil supply is realized, and the lifting action of the auxiliary clamping roller is completed. The control of the magnitude of the pressing force of the auxiliary clamping roller and the position of the pressing roller is realized by controlling a proportional valve of an automatic system, so that the functions of large pressing, light pressing and clamping of the casting blank are realized together with a large-pressing rolling mill.

When the auxiliary clamping roller is pressed down to generate ultrahigh pressure, in order to protect equipment, the pressure overflow is regulated by the 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. At this time, the inlet 1# drive-side auxiliary grip roller hydraulic cylinder 11, the inlet 1# operation-side auxiliary grip roller hydraulic cylinder 15, the inlet 2# drive-side auxiliary grip roller hydraulic cylinder 19, the inlet 2# operation-side auxiliary grip roller hydraulic cylinder 24, the outlet 1# drive-side auxiliary grip roller hydraulic cylinder 61, the outlet 1# operation-side auxiliary grip roller hydraulic cylinder 66, the outlet 2# drive-side auxiliary grip roller hydraulic cylinder 71, and the outlet 2# operation-side auxiliary grip roller hydraulic cylinder 74 are in a high-pressure state without rod chambers. If the pressure continues to rise, 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 are respectively reached, and the corresponding electromagnets I5, II 8, III 45, IV 22, V58, VI 63, VII and 78 are respectively controlled to be de-energized, so that the corresponding electromagnetic unloading valve I6, II 8, III 16, IV 21, V59, VI 62, VII and 77 are de-energized, and the corresponding auxiliary clamping rollers are lifted.

In the normal production process, when a hydraulic system breaks down, pressure oil cannot be supplied normally, and oil supplied by a main oil supply pipe energy accumulator of a hydraulic station can be guaranteed to lift up 4 groups of auxiliary clamping rollers under a high pressure reduction state, so that a casting blank can pass through smoothly until the pouring of the furnace steel is finished. The accumulator 29 absorbs the shock from the pressure fluctuation.

Pressure sensor one 9 detection pressure sensor for realizing rodless cavity oil supply pressure of inlet 1# transmission side auxiliary grip roller hydraulic cylinder 11 second 13 detection pressure sensor for realizing rodless cavity oil supply pressure of inlet 1# operation side auxiliary grip roller hydraulic cylinder 15 third 17 detection pressure sensor for realizing rodless cavity oil supply pressure of inlet 2# transmission side auxiliary grip roller hydraulic cylinder 19 fourth 25 detection pressure sensor for realizing rodless cavity oil supply pressure of inlet 2# operation side auxiliary grip roller hydraulic cylinder 24 fifth 60 detection pressure sensor for realizing rodless cavity oil supply pressure of outlet 1# transmission side auxiliary grip roller hydraulic cylinder 61 sixth 64 detection pressure sensor for realizing rodless cavity oil supply pressure of outlet 1# operation side auxiliary grip roller hydraulic cylinder 66 seventh 72 detection pressure sensor for realizing rodless cavity oil supply pressure of outlet 2# transmission side auxiliary grip roller hydraulic cylinder 71 eighth 76 detection pressure sensor for realizing rodless cavity oil supply pressure of outlet 2# operation side auxiliary grip roller hydraulic cylinder 74 The oil pressure detection pressure sensor nine 26 realizes the detection of the oil supply pressure of the rod cavities of all the auxiliary clamping roller hydraulic cylinders.

Claims

1. Supplementary grip roller hydraulic control valve platform of rolling mill under continuous casting billet is big, its characterized in that includes:

the auxiliary clamping roller hydraulic cylinder (11) on the transmission side of an inlet 1#, 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 inlet 1# operation side auxiliary clamping roller hydraulic cylinder (15), a second check valve (46), a second hydraulic control check valve (48), a second proportional valve (51), a second balance type normally closed logic valve (12), a second electromagnetic unloading valve (8), a second pressure sensor (13) and a second balance valve (14); a first electromagnetic directional valve (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 inlet 2# operation side auxiliary clamping roller hydraulic cylinder (24), a check valve four (37), a hydraulic control check valve four (38), a proportional valve four (34), a balance type normally closed logic valve four (53), an electromagnetic unloading valve four (21), a pressure sensor four (25) and a balance valve four (23); a second electromagnetic directional valve (40);

an outlet 1# transmission side auxiliary clamping roller hydraulic cylinder (61), a one-way valve five (96), a hydraulic control one-way 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 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); a third electromagnetic directional valve (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);

nine pressure sensors (26), five electromagnetic directional valves (28), an energy accumulator (29), an overflow valve (30), a three-way proportional pressure reducing valve (32), nine check valves (35) and ten check valves (36);

a port b of the first hydraulic control check valve (1) is connected with a pressure oil pipe P1, and a port a of the first hydraulic control check valve (1) is connected with a 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 balanced type normally closed logic valve I (4); an a port of a balanced type normally closed logic valve I (4) is communicated with a p port of an electromagnetic unloading valve I (6) and a pressure sensor I (9), and is connected with a rodless cavity of an inlet 1# transmission side auxiliary clamping roller hydraulic cylinder (11) through a ball valve and a hose; a port T of the first proportional valve (3) is connected with a first one-way valve (52) and communicated with an oil return pipeline T; a T port of the electromagnetic unloading valve I (6) is communicated with an oil return pipeline T;

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

a port P of the first electromagnetic directional valve (50) is connected with a main oil supply pipeline P1, a port T of the second pilot-controlled check valve (48) is connected with a main oil return pipeline T, and a port a of the second pilot-controlled check valve (48) is connected with control oil x ports of the first pilot-controlled check valve (1), the second pilot-controlled check valve (48), the first balanced normally-closed logic valve (4) and the second balanced normally-closed logic valve (12); an oil drainage Y port of the hydraulic control one-way valve I (1), the hydraulic control one-way valve II (48), the balanced type normally closed logic valve I (4) and the balanced type normally closed logic valve II (12) is connected with a valve table main oil drainage pipe Y1 in a gathering manner;

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

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

a port P of the second electromagnetic directional valve (40) is connected with a main oil supply pipeline P1, a port T of the second electromagnetic directional valve (40) is connected with a main oil return pipeline T, and a port a of the second electromagnetic directional valve (40) is connected with control oil ports x of a third pilot-controlled check valve (43), a fourth pilot-controlled check valve (38), a third balanced normally-closed logic valve (20) and a fourth balanced normally-closed logic valve (53); oil drainage Y ports of a hydraulic control one-way valve III (43), a hydraulic control one-way valve IV (38), a balanced type normally closed logic valve III (20) and a balanced type normally closed logic valve IV (53) are connected with a valve table main oil drainage pipe Y1 in a summary manner;

a port b of the hydraulic control one-way valve five (54) is connected with a pressure oil pipe P1, and a port a of the hydraulic control one-way valve five (54) is connected with a port P of the proportional valve five (56); the port a of the fifth proportional valve (56) is connected with the port p of the fifth balanced type normally closed logic valve (57); an a port of a balance type normally closed logic valve five (57) is communicated with a p port of an electromagnetic unloading valve five (59) and a pressure sensor five (60), and is connected with a rodless cavity of an outlet 1# transmission side auxiliary clamping roller hydraulic cylinder (61) through a ball valve and a hose; a port T of the proportional valve five (56) is connected with a one-way valve five (96) and communicated with an oil return pipeline T; a port T of the electromagnetic unloading valve V (59) is communicated with an oil return pipeline T;

a port b of the hydraulic control one-way valve six (93) is connected with a pressure oil pipe P1, and a port a of the hydraulic control one-way valve six (93) is connected with a 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 balanced type normally closed logic valve six (67); an a port of a balance type normally closed logic valve six (67) is communicated with a p port of an electromagnetic unloading valve six (62) and a pressure sensor six (64), and is connected with a rodless cavity of an outlet 1# operation side auxiliary clamping roller hydraulic cylinder (66) through a ball valve and a hose; a port T of the proportional valve six (92) is connected with a one-way valve four-six (91) and communicated with an oil return pipeline T; a port T of the electromagnetic unloading valve six (62) is communicated with an oil return pipeline T;

a port P of the third electromagnetic directional valve (95) is connected with a main oil supply pipeline P1, a port T of the third electromagnetic directional valve (95) is connected with a main oil return pipeline T, and a port a of the third electromagnetic directional valve (95) is connected with a port x of a hydraulic control one-way valve five (54), a hydraulic control one-way valve six (93), a balance type normally closed logic valve five (57) and a balance type normally closed logic valve six (67); oil drainage Y ports of a hydraulic control one-way valve five (54), a hydraulic control one-way valve six (93), a balance type normally closed logic valve five (57) and a balance type normally closed logic valve six (67) are connected with a valve table main oil drainage pipe Y1 in a gathering manner;

a port b of the hydraulic control one-way valve seven (89) is connected with a pressure oil pipe P1, and a port a of the electromagnetic directional valve three (95) is connected with a 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 balanced type normally closed logic valve seven (73); an a port of a balance type normally closed logic valve seven (73) is communicated with a p port of an electromagnetic unloading valve seven (68) and a pressure sensor seven (72), and is connected with a rodless cavity of an outlet 2# transmission side auxiliary clamping roller hydraulic cylinder (71) through a ball valve and a hose; a port T of the proportional valve seven (83) is connected with a one-way valve seven (88) and communicated with an oil return pipeline T; a port T of the electromagnetic unloading valve seven (68) is communicated with an oil return pipeline T;

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

a port P of the fourth electromagnetic directional valve (87) is connected with a main oil supply pipeline P1, a port T of the eighth pilot-controlled check valve (84) is connected with a main oil return pipeline T, and a port a of the eighth pilot-controlled check valve (84) is connected with control oil ports x of the seventh pilot-controlled check valve (89), the eighth pilot-controlled check valve (84), the seventh balanced normally-closed logic valve (73) and the eighth balanced normally-closed logic valve (79); oil drainage Y ports of a hydraulic control one-way valve seven (89), a hydraulic control one-way valve eight (84), a balance type normally closed logic valve seven (73) and a balance type normally closed logic valve eight (79) are connected with a valve table main oil drainage pipe Y1 in a gathering mode;

a rod cavity of the inlet 1# transmission side auxiliary clamping roller hydraulic cylinder (11) is communicated with an a port of a balance valve I (10), and a rod cavity of the inlet 1# operation side auxiliary clamping roller hydraulic cylinder (15) is communicated with an a port of a balance valve II (14); a rod cavity of the inlet 2# transmission side auxiliary clamping roller hydraulic cylinder (19) is communicated with an a port of a balance valve III (18); the rod cavity of the inlet 2# operation side auxiliary clamping roller hydraulic cylinder (24) is communicated with the port a of the balance valve IV (23); a rod cavity of the outlet 1# transmission side auxiliary clamping roller hydraulic cylinder (61) is communicated with an a port of a balance valve V (97); a rod cavity of the outlet 1# operation side auxiliary clamping roller hydraulic cylinder (66) is communicated with an a port of a balance valve six (65); a rod cavity of the outlet 2# transmission side auxiliary clamping roller hydraulic cylinder (71) is communicated with an a port of a balance valve seven (70), and a rod cavity of the outlet 2# operation side auxiliary clamping roller hydraulic cylinder (74) is communicated with an a port of a balance valve eight (75);

the port b of the balance valve I (10), 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 V (97), the port b of the balance valve VI (65), the port b of the balance valve VII (70) and the port b of the balance valve eight (75) are converged into an oil path after passing through a ball valve and a rubber tube, and communicated with the port a of the electromagnetic directional valve V (28) and the pressure sensor nine (26); a port p of the electromagnetic directional valve five (28) is communicated with a port a of the three-way proportional pressure reducing valve (32), a port p of the overflow valve (30), a port b of the check valve ten (36) and a port p of the energy accumulator (29); a port P of the three-way proportional pressure reducing valve (32) is connected with a total pressure oil pipe P1 of the valve table, and a port T of the three-way proportional pressure reducing valve (32) is communicated with an oil return pipeline T through a one-way valve nine (35); a T port of the overflow valve (30) and a T port of the energy accumulator (29) are connected to a valve table main oil return pipe T; the port a of the check valve ten (36) is communicated with the oil return pipeline T.

2. The valve table according to claim 1, wherein the pressure sensor I (9), the pressure sensor II (13), the pressure sensor III (17), the pressure sensor IV (25), the pressure sensor V (60), the pressure sensor VI (64), the pressure sensor VII (72), the pressure sensor VIII (76) and the pressure sensor IX (26) all have analog quantity output functions and are mechanical sensors.

3. The valve table of claim 1, wherein the pilot operated check valve one (1), the pilot operated check valve two (48), the pilot operated check valve three (43), the pilot operated check valve four (38), the pilot operated check valve five (54), the pilot operated check valve six (93), the pilot operated check valve seven (89), and the pilot operated check valve eight (84) are external control leakage pilot operated check valves.

4. The valve stand of claim 1, wherein the first proportional valve (3), the second proportional valve (51), the third proportional valve (44), the fourth proportional valve (34), the fifth proportional valve (56), the sixth proportional valve (92), the seventh proportional valve (83) and the eighth proportional valve (81) are of a direct-acting type, a current-controlled type, a three-position four-way type, a proportional electromagnet and a directional valve.

5. The valve stand of claim 1, wherein said electromagnetic directional valve five (28) is a 2-position 2-way directional valve.

6. The valve stand of 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.

7. The valve station of claim 1, wherein the balanced normally closed logic valve one (4), the balanced normally closed logic valve two (12), the balanced normally closed logic valve three (20), the balanced normally closed logic valve four (53), the balanced normally closed logic valve five (57), the balanced normally closed logic valve six (67), the balanced normally closed logic valve seven (73) and the balanced normally closed logic valve eight (79) are 2-position 2-way, pilot-controlled, and normally closed logic valves.

8. The valve stand 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.

9. The valve station as claimed in claim 1, characterized in that the overflow valve (30) is a direct-acting overflow valve.

10. The valve station of claim 1, wherein the first pressure relief valve (32) is a three-way, proportional solenoid, current controlled pressure relief valve.